Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries/ --ompython_omhome=/usr OpenIPSL_2.0.0_OpenIPSL.Examples.PSATSystems.TwoAreaOld.FourthOrder_AVRII.conf.json loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica_Synchronous 0.93.0/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo", uses=false) loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/OpenIPSL 2.0.0/package.mo", uses=false) Using package OpenIPSL with version 2.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/OpenIPSL 2.0.0/package.mo) Using package Complex with version 4.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo) Using package Modelica with version 3.2.3 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/package.mo) Using package ModelicaServices with version 4.0.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo) Using package Modelica_Synchronous with version 0.93.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica_Synchronous 0.93.0/package.mo) Running command: translateModel(OpenIPSL.Examples.PSATSystems.TwoAreaOld.FourthOrder_AVRII,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="OpenIPSL_2.0.0_OpenIPSL.Examples.PSATSystems.TwoAreaOld.FourthOrder_AVRII") translateModel(OpenIPSL.Examples.PSATSystems.TwoAreaOld.FourthOrder_AVRII,tolerance=1e-06,outputFormat="empty",numberOfIntervals=5000,variableFilter="",fileNamePrefix="OpenIPSL_2.0.0_OpenIPSL.Examples.PSATSystems.TwoAreaOld.FourthOrder_AVRII") Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica_Synchronous 0.93.0/package.mo): time 0.1021/0.1021, allocations: 12.2 MB / 27.17 MB, free: 1.516 MB / 19.63 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.0.0+maint.om/package.mo): time 0.0007287/0.0007288, allocations: 100.5 kB / 30.68 MB, free: 4.867 MB / 26.18 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/package.mo): time 1.544/1.544, allocations: 205.4 MB / 239.5 MB, free: 13.61 MB / 206.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.0.0+maint.om/package.mo): time 0.001518/0.001518, allocations: 176.5 kB / 290.6 MB, free: 11.64 MB / 238.1 MB Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/OpenIPSL 2.0.0/package.mo): time 0.5081/0.5081, allocations: 78.54 MB / 420.1 MB, free: 11.65 MB / 302.1 MB Notification: Modelica_Synchronous requested package ModelicaServices of version 3.2.3. ModelicaServices 4.0.0 is used instead which states that it is fully compatible without conversion script needed. Notification: Modelica requested package Complex of version 3.2.3. Complex 4.0.0 is used instead which states that it is fully compatible without conversion script needed. Notification: Modelica requested package ModelicaServices of version 3.2.3. ModelicaServices 4.0.0 is used instead which states that it is fully compatible without conversion script needed. Notification: OpenIPSL requested package Complex of version 3.2.3. Complex 4.0.0 is used instead which states that it is fully compatible without conversion script needed. Notification: Performance of FrontEnd - loaded program: time 0.001374/0.001374, allocations: 28 kB / 0.4895 GB, free: 10.5 MB / 382.1 MB Notification: Performance of FrontEnd - Absyn->SCode: time 0.4072/0.4086, allocations: 69.23 MB / 0.5571 GB, free: 21.04 MB / 382.1 MB Notification: Performance of NFInst.instantiate(OpenIPSL.Examples.PSATSystems.TwoAreaOld.FourthOrder_AVRII): time 0.004887/0.4136, allocations: 6.049 MB / 0.563 GB, free: 14.97 MB / 382.1 MB Notification: Performance of NFInst.instExpressions: time 0.003941/0.4176, allocations: 1.878 MB / 0.5648 GB, free: 13.08 MB / 382.1 MB Notification: Performance of NFInst.updateImplicitVariability: time 0.0007233/0.4183, allocations: 8 kB / 0.5648 GB, free: 13.07 MB / 382.1 MB Notification: Performance of NFTyping.typeComponents: time 0.0006443/0.419, allocations: 166.8 kB / 0.565 GB, free: 12.91 MB / 382.1 MB Notification: Performance of NFTyping.typeBindings: time 0.001653/0.4207, allocations: 0.6641 MB / 0.5656 GB, free: 12.25 MB / 382.1 MB [/home/hudson/saved_omc/libraries/.openmodelica/libraries/OpenIPSL 2.0.0/Electrical/Machines/PSAT/Order4.mo:25:3-30:9:writable] Warning: In relation order4.xq <> order4.x1q, <> on Real numbers is only allowed inside functions. Notification: Performance of NFTyping.typeClassSections: time 0.00105/0.4217, allocations: 0.5215 MB / 0.5661 GB, free: 11.73 MB / 382.1 MB Notification: Performance of NFFlatten.flatten: time 0.001107/0.4228, allocations: 1.409 MB / 0.5675 GB, free: 10.32 MB / 382.1 MB Notification: Performance of NFFlatten.resolveConnections: time 0.0003507/0.4232, allocations: 257.8 kB / 0.5678 GB, free: 10.05 MB / 382.1 MB Notification: Performance of NFEvalConstants.evaluate: time 0.0005116/0.4237, allocations: 0.5561 MB / 0.5683 GB, free: 9.492 MB / 382.1 MB Notification: Performance of NFSimplifyModel.simplify: time 0.0006159/0.4243, allocations: 0.7272 MB / 0.569 GB, free: 8.762 MB / 382.1 MB Notification: Performance of NFPackage.collectConstants: time 0.0001035/0.4244, allocations: 64 kB / 0.5691 GB, free: 8.699 MB / 382.1 MB Notification: Performance of NFFlatten.collectFunctions: time 0.0003952/0.4249, allocations: 179.9 kB / 0.5692 GB, free: 8.523 MB / 382.1 MB Notification: Performance of NFScalarize.scalarize: time 0.0001918/0.4251, allocations: 254.7 kB / 0.5695 GB, free: 8.273 MB / 382.1 MB Notification: Performance of NFVerifyModel.verify: time 0.0001716/0.4252, allocations: 229 kB / 0.5697 GB, free: 8.043 MB / 382.1 MB Notification: Performance of NFConvertDAE.convert: time 0.0008244/0.4261, allocations: 1.223 MB / 0.5709 GB, free: 6.816 MB / 382.1 MB Notification: Performance of FrontEnd - DAE generated: time 6.502e-06/0.4261, allocations: 0 / 0.5709 GB, free: 6.816 MB / 382.1 MB Notification: Performance of FrontEnd: time 2.074e-06/0.4261, allocations: 0 / 0.5709 GB, free: 6.816 MB / 382.1 MB Notification: Performance of Transformations before backend: time 1.213e-05/0.4261, allocations: 0 / 0.5709 GB, free: 6.816 MB / 382.1 MB Notification: Model statistics after passing the front-end and creating the data structures used by the back-end: * Number of equations: 190 * Number of variables: 190 Notification: Performance of Generate backend data structure: time 0.006736/0.4328, allocations: 2.513 MB / 0.5734 GB, free: 4.238 MB / 382.1 MB Notification: Performance of prepare preOptimizeDAE: time 4.358e-05/0.4329, allocations: 11.98 kB / 0.5734 GB, free: 4.227 MB / 382.1 MB Notification: Performance of preOpt normalInlineFunction (simulation): time 0.004554/0.4375, allocations: 0.7826 MB / 0.5741 GB, free: 3.441 MB / 382.1 MB Notification: Performance of preOpt evaluateParameters (simulation): time 0.00151/0.439, allocations: 0.8366 MB / 0.575 GB, free: 2.551 MB / 382.1 MB Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.0002377/0.4392, allocations: 276.1 kB / 0.5752 GB, free: 2.242 MB / 382.1 MB Notification: Performance of preOpt expandDerOperator (simulation): time 0.0001289/0.4394, allocations: 92 kB / 0.5753 GB, free: 2.152 MB / 382.1 MB Notification: Performance of preOpt clockPartitioning (simulation): time 0.001821/0.4412, allocations: 1.141 MB / 0.5764 GB, free: 1 MB / 382.1 MB Notification: Performance of preOpt findStateOrder (simulation): time 1.736e-05/0.4412, allocations: 0 / 0.5764 GB, free: 1 MB / 382.1 MB Notification: Performance of preOpt replaceEdgeChange (simulation): time 8.409e-05/0.4413, allocations: 24 kB / 0.5764 GB, free: 0.9766 MB / 382.1 MB Notification: Performance of preOpt inlineArrayEqn (simulation): time 1.703e-05/0.4413, allocations: 23.98 kB / 0.5765 GB, free: 0.9531 MB / 382.1 MB Notification: Performance of preOpt removeEqualRHS (simulation): time 0.001771/0.4431, allocations: 1.046 MB / 0.5775 GB, free: 15.91 MB / 398.1 MB Warning: The model contains alias variables with redundant start and/or conflicting nominal values. It is recommended to resolve the conflicts, because otherwise the system could be hard to solve. To print the conflicting alias sets and the chosen candidates please use -d=aliasConflicts. Notification: Performance of preOpt removeSimpleEquations (simulation): time 0.006801/0.4499, allocations: 3.898 MB / 0.5813 GB, free: 11.83 MB / 398.1 MB Notification: Performance of preOpt comSubExp (simulation): time 0.007418/0.4574, allocations: 2.913 MB / 0.5841 GB, free: 8.828 MB / 398.1 MB Notification: Performance of preOpt resolveLoops (simulation): time 0.001575/0.459, allocations: 0.7395 MB / 0.5849 GB, free: 8.082 MB / 398.1 MB Notification: Performance of preOpt evalFunc (simulation): time 0.0001171/0.4591, allocations: 20.97 kB / 0.5849 GB, free: 8.062 MB / 398.1 MB Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 0.001583/0.4607, allocations: 0.8763 MB / 0.5857 GB, free: 7.168 MB / 398.1 MB Notification: Performance of pre-optimization done (n=96): time 2.204e-06/0.4607, allocations: 3.938 kB / 0.5857 GB, free: 7.164 MB / 398.1 MB Notification: Performance of matching and sorting (n=96): time 0.02758/0.4883, allocations: 8.64 MB / 0.5942 GB, free: 14.45 MB / 414.1 MB Notification: Performance of inlineWhenForInitialization (initialization): time 8.843e-05/0.4885, allocations: 115.8 kB / 0.5943 GB, free: 14.32 MB / 414.1 MB Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.002166/0.4906, allocations: 1.075 MB / 0.5953 GB, free: 13.23 MB / 414.1 MB Notification: Performance of collectPreVariables (initialization): time 0.0002679/0.4909, allocations: 45.7 kB / 0.5954 GB, free: 13.18 MB / 414.1 MB Notification: Performance of collectInitialEqns (initialization): time 0.0005432/0.4915, allocations: 496.7 kB / 0.5959 GB, free: 12.68 MB / 414.1 MB Notification: Performance of collectInitialBindings (initialization): time 0.0006394/0.4921, allocations: 355 kB / 0.5962 GB, free: 12.33 MB / 414.1 MB Notification: Performance of simplifyInitialFunctions (initialization): time 0.0002387/0.4924, allocations: 32 kB / 0.5962 GB, free: 12.3 MB / 414.1 MB Notification: Performance of setup shared object (initialization): time 0.0002284/0.4926, allocations: 361.9 kB / 0.5966 GB, free: 11.94 MB / 414.1 MB Notification: Performance of preBalanceInitialSystem (initialization): time 0.001924/0.4945, allocations: 0.8199 MB / 0.5974 GB, free: 11.12 MB / 414.1 MB Notification: Performance of partitionIndependentBlocks (initialization): time 0.001964/0.4965, allocations: 0.9968 MB / 0.5983 GB, free: 10.09 MB / 414.1 MB Notification: Performance of analyzeInitialSystem (initialization): time 0.002059/0.4986, allocations: 0.9523 MB / 0.5993 GB, free: 9.125 MB / 414.1 MB Notification: Performance of solveInitialSystemEqSystem (initialization): time 1.08e-05/0.4986, allocations: 4 kB / 0.5993 GB, free: 9.121 MB / 414.1 MB Notification: Performance of matching and sorting (n=196) (initialization): time 0.01416/0.5128, allocations: 5.157 MB / 0.6043 GB, free: 3.938 MB / 414.1 MB Notification: Performance of prepare postOptimizeDAE: time 8.807e-05/0.5129, allocations: 63.39 kB / 0.6044 GB, free: 3.863 MB / 414.1 MB Notification: Performance of postOpt simplifyComplexFunction (initialization): time 2.157e-05/0.513, allocations: 4 kB / 0.6044 GB, free: 3.859 MB / 414.1 MB Notification: Performance of postOpt tearingSystem (initialization): time 0.00618/0.5192, allocations: 1.904 MB / 0.6062 GB, free: 1.953 MB / 414.1 MB Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.001534/0.5207, allocations: 299.6 kB / 0.6065 GB, free: 1.66 MB / 414.1 MB Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.02033/0.5411, allocations: 9.026 MB / 0.6153 GB, free: 8.504 MB / 430.1 MB Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.002026/0.5431, allocations: 234.7 kB / 0.6156 GB, free: 8.273 MB / 430.1 MB Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.000325/0.5435, allocations: 55.97 kB / 0.6156 GB, free: 8.219 MB / 430.1 MB Warning: Assuming fixed start value for the following 4 variables: order4.w:VARIABLE(flow=false start = 1.0 fixed = true ) "Rotor speed [pu]" type: Real aVRTypeII.firstOrder2.y:VARIABLE(flow=false start = aVRTypeII.firstOrder2.y_start fixed = true ) "Connector of Real output signal" type: Real order4.e1d:VARIABLE(start = order4.e1d0 unit = "1" fixed = true ) "d-axis transient voltage" type: Real order4.e1q:VARIABLE(start = order4.e1q0 unit = "1" fixed = true ) "q-axis transient voltage" type: Real Notification: Model statistics after passing the back-end for initialization: * Number of independent subsystems: 13 * Number of states: 0 () * Number of discrete variables: 2 ($whenCondition1,$whenCondition2) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for initialization (164): * Single equations (assignments): 161 * Array equations: 0 * Algorithm blocks: 2 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (linear and non-linear blocks): 0 * Torn equation systems: 1 * Mixed (continuous/discrete) equation systems: 0 Notification: Torn system details for strict tearing set: * Linear torn systems: 0 * Non-linear torn systems: 1 {19 14} Notification: Performance of prepare postOptimizeDAE: time 0.0009058/0.5444, allocations: 308.2 kB / 0.6159 GB, free: 7.906 MB / 430.1 MB Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0003762/0.5448, allocations: 122.6 kB / 0.616 GB, free: 7.785 MB / 430.1 MB Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.01276/0.5576, allocations: 4.713 MB / 0.6206 GB, free: 3.043 MB / 430.1 MB Notification: Performance of postOpt inlineArrayEqn (simulation): time 2.18e-05/0.5576, allocations: 8 kB / 0.6206 GB, free: 3.035 MB / 430.1 MB Notification: Performance of postOpt constantLinearSystem (simulation): time 2.718e-05/0.5577, allocations: 12 kB / 0.6206 GB, free: 3.023 MB / 430.1 MB Notification: Performance of postOpt simplifysemiLinear (simulation): time 2.919e-05/0.5577, allocations: 3.984 kB / 0.6206 GB, free: 3.02 MB / 430.1 MB Warning: The model contains alias variables with redundant start and/or conflicting nominal values. It is recommended to resolve the conflicts, because otherwise the system could be hard to solve. To print the conflicting alias sets and the chosen candidates please use -d=aliasConflicts. Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.01538/0.5731, allocations: 6.29 MB / 0.6268 GB, free: 12.62 MB / 446.1 MB Notification: Performance of postOpt simplifyComplexFunction (simulation): time 1.718e-05/0.5732, allocations: 4 kB / 0.6268 GB, free: 12.62 MB / 446.1 MB Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0006481/0.5738, allocations: 103.9 kB / 0.6269 GB, free: 12.52 MB / 446.1 MB Notification: Performance of postOpt tearingSystem (simulation): time 0.005515/0.5793, allocations: 1.892 MB / 0.6287 GB, free: 10.62 MB / 446.1 MB Notification: Performance of postOpt inputDerivativesUsed (simulation): time 0.0001951/0.5796, allocations: 27.98 kB / 0.6288 GB, free: 10.59 MB / 446.1 MB Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.01901/0.5986, allocations: 9.645 MB / 0.6382 GB, free: 0.6602 MB / 446.1 MB Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 2.776e-06/0.5986, allocations: 0 / 0.6382 GB, free: 0.6602 MB / 446.1 MB Notification: Performance of postOpt symbolicJacobian (simulation): time 0.01471/0.6133, allocations: 5.635 MB / 0.6437 GB, free: 10.99 MB / 462.1 MB Notification: Performance of postOpt removeConstants (simulation): time 0.0005676/0.614, allocations: 223.3 kB / 0.6439 GB, free: 10.75 MB / 462.1 MB Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.0003855/0.6144, allocations: 23.98 kB / 0.6439 GB, free: 10.73 MB / 462.1 MB Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.001281/0.6157, allocations: 147.8 kB / 0.6441 GB, free: 10.58 MB / 462.1 MB Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0006666/0.6163, allocations: 192.8 kB / 0.6442 GB, free: 10.39 MB / 462.1 MB Notification: Performance of postOpt collapseArrayExpressions (simulation): time 0.0001254/0.6165, allocations: 27.98 kB / 0.6443 GB, free: 10.36 MB / 462.1 MB Notification: Performance of sorting global known variables: time 0.001519/0.618, allocations: 0.7234 MB / 0.645 GB, free: 9.633 MB / 462.1 MB Notification: Performance of sort global known variables: time 2.5e-07/0.618, allocations: 4 kB / 0.645 GB, free: 9.629 MB / 462.1 MB Notification: Performance of remove unused functions: time 0.002/0.62, allocations: 479.5 kB / 0.6454 GB, free: 9.16 MB / 462.1 MB Notification: Model statistics after passing the back-end for simulation: * Number of independent subsystems: 2 * Number of states: 10 (order2.delta,order2.w,order4.delta,order4.w,order4.e1q,order4.e1d,aVRTypeII.ExcitationSystem.x_scaled[1],aVRTypeII.derivativeBlock.x,aVRTypeII.firstOrder2.y,aVRTypeII.simpleLagLim.state) * Number of discrete variables: 2 ($whenCondition1,$whenCondition2) * Number of discrete states: 0 () * Number of clocked states: 0 () * Top-level inputs: 0 Notification: Strong component statistics for simulation (64): * Single equations (assignments): 61 * Array equations: 0 * Algorithm blocks: 1 * Record equations: 0 * When equations: 0 * If-equations: 0 * Equation systems (linear and non-linear blocks): 0 * Torn equation systems: 2 * Mixed (continuous/discrete) equation systems: 0 Notification: Torn system details for strict tearing set: * Linear torn systems: 1 {(21,21.8%) 11} * Non-linear torn systems: 1 {1 6} Notification: Performance of Backend phase and start with SimCode phase: time 0.0003906/0.6204, allocations: 141.5 kB / 0.6456 GB, free: 9.02 MB / 462.1 MB Notification: Performance of simCode: created initialization part: time 0.006699/0.6272, allocations: 2.786 MB / 0.6483 GB, free: 6.191 MB / 462.1 MB Notification: Performance of simCode: created event and clocks part: time 5.39e-06/0.6272, allocations: 0 / 0.6483 GB, free: 6.191 MB / 462.1 MB Notification: Performance of simCode: created simulation system equations: time 0.004534/0.6317, allocations: 1.826 MB / 0.6501 GB, free: 4.328 MB / 462.1 MB Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.001386/0.6331, allocations: 105 kB / 0.6502 GB, free: 4.223 MB / 462.1 MB Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.004867/0.638, allocations: 2.648 MB / 0.6528 GB, free: 1.547 MB / 462.1 MB Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0008847/0.6389, allocations: 1.12 MB / 0.6539 GB, free: 408 kB / 462.1 MB Notification: Performance of simCode: alias equations: time 0.0005559/0.6395, allocations: 120 kB / 0.654 GB, free: 284 kB / 462.1 MB Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0003253/0.6398, allocations: 75.42 kB / 0.654 GB, free: 212 kB / 462.1 MB Notification: Performance of SimCode: time 1.903e-06/0.6399, allocations: 0 / 0.654 GB, free: 212 kB / 462.1 MB Notification: Performance of Templates: time 0.03755/0.6774, allocations: 21.31 MB / 0.6749 GB, free: 10.91 MB / 494.1 MB make -j1 -f OpenIPSL_2.0.0_OpenIPSL.Examples.PSATSystems.TwoAreaOld.FourthOrder_AVRII.makefile Environment - environmentSimulation: (rm -f OpenIPSL_2.0.0_OpenIPSL.Examples.PSATSystems.TwoAreaOld.FourthOrder_AVRII.pipe ; mkfifo OpenIPSL_2.0.0_OpenIPSL.Examples.PSATSystems.TwoAreaOld.FourthOrder_AVRII.pipe ; head -c 1048576 < OpenIPSL_2.0.0_OpenIPSL.Examples.PSATSystems.TwoAreaOld.FourthOrder_AVRII.pipe >> ../files/OpenIPSL_2.0.0_OpenIPSL.Examples.PSATSystems.TwoAreaOld.FourthOrder_AVRII.sim & ./OpenIPSL_2.0.0_OpenIPSL.Examples.PSATSystems.TwoAreaOld.FourthOrder_AVRII -abortSlowSimulation -alarm=480 -lv LOG_STATS > OpenIPSL_2.0.0_OpenIPSL.Examples.PSATSystems.TwoAreaOld.FourthOrder_AVRII.pipe 2>&1) Environment - environmentSimulation: