Running: ./testmodel.py --libraries=/home/hudson/saved_omc/libraries/.openmodelica/libraries --ompython_omhome=/usr OpenIPSL_2.0.0_OpenIPSL.Tests.Machines.PSSE.GENCLS.conf.json
loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica_Synchronous 0.93.0/package.mo", uses=false) [Timeout 180]
"Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica_Synchronous 0.93.0/package.mo): time 0.08729/0.08729, allocations: 12.35 MB / 31.2 MB, free: 6.434 MB / 26.18 MB
"
[Timeout remaining time 180]
loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.1.0+maint.om/package.mo", uses=false) [Timeout 180]
"Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.1.0+maint.om/package.mo): time 0.001331/0.001331, allocations: 109 kB / 37.24 MB, free: 1.113 MB / 26.18 MB
"
[Timeout remaining time 180]
loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/package.mo", uses=false) [Timeout 180]
"Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Modelica 3.2.3+maint.om/package.mo): time 1.456/1.456, allocations: 207.7 MB / 250.9 MB, free: 7.277 MB / 190.1 MB
"
[Timeout remaining time 178]
loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.1.0+maint.om/package.mo", uses=false) [Timeout 180]
"Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.1.0+maint.om/package.mo): time 0.001907/0.001907, allocations: 212.4 kB / 306.1 MB, free: 308 kB / 238.1 MB
"
[Timeout remaining time 180]
loadFile("/home/hudson/saved_omc/libraries/.openmodelica/libraries/OpenIPSL 2.0.0/package.mo", uses=false) [Timeout 180]
"Notification: Performance of loadFile(/home/hudson/saved_omc/libraries/.openmodelica/libraries/OpenIPSL 2.0.0/package.mo): time 0.3291/0.3291, allocations: 79.72 MB / 440.9 MB, free: 12.28 MB / 318.1 MB
"
[Timeout remaining time 179]
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 4.1.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/Complex 4.1.0+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 4.1.0 (/home/hudson/saved_omc/libraries/.openmodelica/libraries/ModelicaServices 4.1.0+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: "" <> buildModelFMU(OpenIPSL.Tests.Machines.PSSE.GENCLS,fileNamePrefix="OpenIPSL_2_0_0_OpenIPSL_Tests_Machines_PSSE_GENCLS",fmuType="me",version="2.0",platforms={"static"})
"" <> buildModelFMU(OpenIPSL.Tests.Machines.PSSE.GENCLS,fileNamePrefix="OpenIPSL_2_0_0_OpenIPSL_Tests_Machines_PSSE_GENCLS",fmuType="me",version="2.0",platforms={"static"}) [Timeout 660]
"Notification: Modelica_Synchronous requested package ModelicaServices of version 3.2.3. ModelicaServices 4.1.0 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 4.1.0 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 4.1.0 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 4.1.0 is used instead which states that it is fully compatible without conversion script needed.
Notification: Performance of FrontEnd - loaded program: time 0.004185/0.004185, allocations: 147.8 kB / 0.5875 GB, free: 9.367 MB / 398.1 MB
Notification: Performance of FrontEnd - Absyn->SCode: time 0.1331/0.1372, allocations: 71.97 MB / 0.6578 GB, free: 1.336 MB / 462.1 MB
Notification: Performance of NFInst.instantiate(OpenIPSL.Tests.Machines.PSSE.GENCLS): time 0.265/0.4022, allocations: 5.436 MB / 0.6631 GB, free: 8.117 MB / 462.1 MB
Notification: Performance of NFInst.instExpressions: time 0.004083/0.4063, allocations: 1.747 MB / 0.6648 GB, free: 7.453 MB / 462.1 MB
Notification: Performance of NFInst.updateImplicitVariability: time 0.0006724/0.407, allocations: 9.5 kB / 0.6648 GB, free: 7.453 MB / 462.1 MB
Notification: Performance of NFTyping.typeComponents: time 0.0006242/0.4076, allocations: 240 kB / 0.665 GB, free: 7.34 MB / 462.1 MB
Notification: Performance of NFTyping.typeBindings: time 0.002132/0.4098, allocations: 0.8358 MB / 0.6658 GB, free: 6.973 MB / 462.1 MB
Notification: Performance of NFTyping.typeClassSections: time 0.001505/0.4113, allocations: 0.6357 MB / 0.6665 GB, free: 6.723 MB / 462.1 MB
Notification: Performance of NFFlatten.flatten: time 0.002104/0.4134, allocations: 1.631 MB / 0.6681 GB, free: 5.957 MB / 462.1 MB
Notification: Performance of NFFlatten.resolveConnections: time 0.0003765/0.4137, allocations: 197.9 kB / 0.6682 GB, free: 5.848 MB / 462.1 MB
Notification: Performance of NFEvalConstants.evaluate: time 0.0009521/0.4147, allocations: 0.6272 MB / 0.6689 GB, free: 5.551 MB / 462.1 MB
Notification: Performance of NFSimplifyModel.simplify: time 0.0008962/0.4156, allocations: 0.7397 MB / 0.6696 GB, free: 5.25 MB / 462.1 MB
Notification: Performance of NFPackage.collectConstants: time 0.0002248/0.4158, allocations: 116.6 kB / 0.6697 GB, free: 5.25 MB / 462.1 MB
Notification: Performance of NFFlatten.collectFunctions: time 0.000677/0.4165, allocations: 227.4 kB / 0.6699 GB, free: 5.223 MB / 462.1 MB
Notification: Performance of NFScalarize.scalarize: time 0.0002529/0.4167, allocations: 314.5 kB / 0.6702 GB, free: 5.016 MB / 462.1 MB
Notification: Performance of NFVerifyModel.verify: time 0.0005399/0.4173, allocations: 0.5243 MB / 0.6707 GB, free: 4.707 MB / 462.1 MB
Notification: Performance of NFConvertDAE.convert: time 0.001912/0.4192, allocations: 1.59 MB / 0.6723 GB, free: 3.992 MB / 462.1 MB
Notification: Performance of FrontEnd - DAE generated: time 6.042e-06/0.4192, allocations: 0 / 0.6723 GB, free: 3.992 MB / 462.1 MB
Notification: Performance of FrontEnd: time 1.664e-06/0.4192, allocations: 3.938 kB / 0.6723 GB, free: 3.988 MB / 462.1 MB
Notification: Performance of Transformations before backend: time 2.497e-05/0.4192, allocations: 0 / 0.6723 GB, free: 3.988 MB / 462.1 MB
Notification: Model statistics after passing the front-end and creating the data structures used by the back-end:
 * Number of equations: 179
 * Number of variables: 179
Notification: Performance of Generate backend data structure: time 0.008374/0.4276, allocations: 2.587 MB / 0.6748 GB, free: 2.891 MB / 462.1 MB
Notification: Performance of prepare preOptimizeDAE: time 4.891e-05/0.4277, allocations: 12.09 kB / 0.6748 GB, free: 2.891 MB / 462.1 MB
Notification: Performance of preOpt introduceOutputAliases (simulation): time 0.0001435/0.4278, allocations: 116.8 kB / 0.6749 GB, free: 2.805 MB / 462.1 MB
Notification: Performance of preOpt normalInlineFunction (simulation): time 0.00399/0.4318, allocations: 0.6855 MB / 0.6756 GB, free: 2.66 MB / 462.1 MB
Notification: Performance of preOpt evaluateParameters (simulation): time 0.001198/0.433, allocations: 0.7508 MB / 0.6763 GB, free: 2.141 MB / 462.1 MB
Notification: Performance of preOpt simplifyIfEquations (simulation): time 0.0003034/0.4333, allocations: 443.9 kB / 0.6768 GB, free: 1.703 MB / 462.1 MB
Notification: Performance of preOpt expandDerOperator (simulation): time 0.0001435/0.4334, allocations: 81.33 kB / 0.6768 GB, free: 1.672 MB / 462.1 MB
Notification: Performance of preOpt clockPartitioning (simulation): time 0.002208/0.4356, allocations: 1.141 MB / 0.6779 GB, free: 1.242 MB / 462.1 MB
Notification: Performance of preOpt findStateOrder (simulation): time 2.181e-05/0.4357, allocations: 0 / 0.6779 GB, free: 1.242 MB / 462.1 MB
Notification: Performance of preOpt replaceEdgeChange (simulation): time 8.994e-05/0.4358, allocations: 30.69 kB / 0.678 GB, free: 1.219 MB / 462.1 MB
Notification: Performance of preOpt inlineArrayEqn (simulation): time 1.181e-05/0.4358, allocations: 16.22 kB / 0.678 GB, free: 1.219 MB / 462.1 MB
Notification: Performance of preOpt removeEqualRHS (simulation): time 0.002215/0.438, allocations: 1.075 MB / 0.679 GB, free: 0.8672 MB / 462.1 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 0.005894/0.4439, allocations: 2.738 MB / 0.6817 GB, free: 15.43 MB / 478.1 MB
Notification: Performance of preOpt comSubExp (simulation): time 0.007666/0.4515, allocations: 1.976 MB / 0.6836 GB, free: 15.04 MB / 478.1 MB
Notification: Performance of preOpt resolveLoops (simulation): time 0.001903/0.4534, allocations: 0.7032 MB / 0.6843 GB, free: 14.78 MB / 478.1 MB
Notification: Performance of preOpt evalFunc (simulation): time 0.0001176/0.4536, allocations: 17.86 kB / 0.6843 GB, free: 14.77 MB / 478.1 MB
Notification: Performance of preOpt encapsulateWhenConditions (simulation): time 5.672e-05/0.4536, allocations: 48.64 kB / 0.6844 GB, free: 14.72 MB / 478.1 MB
Notification: Performance of pre-optimization done (n=97): time 3.126e-06/0.4536, allocations: 0.5312 kB / 0.6844 GB, free: 14.72 MB / 478.1 MB
Notification: Performance of matching and sorting (n=97): time 0.04073/0.4943, allocations: 9.285 MB / 0.6935 GB, free: 10.22 MB / 478.1 MB
Notification: Performance of inlineWhenForInitialization (initialization): time 8.342e-05/0.4944, allocations: 92.64 kB / 0.6935 GB, free: 10.12 MB / 478.1 MB
Notification: Performance of selectInitializationVariablesDAE (initialization): time 0.001676/0.4961, allocations: 0.9089 MB / 0.6944 GB, free: 9.598 MB / 478.1 MB
Notification: Performance of collectPreVariables (initialization): time 0.0002704/0.4964, allocations: 41.2 kB / 0.6945 GB, free: 9.555 MB / 478.1 MB
Notification: Performance of collectInitialEqns (initialization): time 0.0004136/0.4968, allocations: 475.9 kB / 0.6949 GB, free: 9.137 MB / 478.1 MB
Notification: Performance of collectInitialBindings (initialization): time 0.0004834/0.4973, allocations: 367.5 kB / 0.6953 GB, free: 8.816 MB / 478.1 MB
Notification: Performance of simplifyInitialFunctions (initialization): time 0.00041/0.4977, allocations: 167.9 kB / 0.6954 GB, free: 8.711 MB / 478.1 MB
Notification: Performance of setup shared object (initialization): time 0.0001816/0.4979, allocations: 346.8 kB / 0.6958 GB, free: 8.375 MB / 478.1 MB
Notification: Performance of preBalanceInitialSystem (initialization): time 0.00164/0.4995, allocations: 0.6699 MB / 0.6964 GB, free: 8.051 MB / 478.1 MB
Notification: Performance of partitionIndependentBlocks (initialization): time 0.001788/0.5013, allocations: 0.8307 MB / 0.6972 GB, free: 7.547 MB / 478.1 MB
Notification: Performance of analyzeInitialSystem (initialization): time 0.003414/0.5047, allocations: 1.525 MB / 0.6987 GB, free: 6.695 MB / 478.1 MB
Notification: Performance of solveInitialSystemEqSystem (initialization): time 1.066e-05/0.5047, allocations: 5.031 kB / 0.6987 GB, free: 6.691 MB / 478.1 MB
Notification: Performance of matching and sorting (n=129) (initialization): time 0.01625/0.521, allocations: 4.508 MB / 0.7031 GB, free: 4.492 MB / 478.1 MB
Notification: Performance of prepare postOptimizeDAE: time 2.646e-05/0.521, allocations: 5.969 kB / 0.7031 GB, free: 4.492 MB / 478.1 MB
Notification: Performance of postOpt simplifyComplexFunction (initialization): time 1.15e-05/0.521, allocations: 2.688 kB / 0.7031 GB, free: 4.492 MB / 478.1 MB
Notification: Performance of postOpt tearingSystem (initialization): time 0.009114/0.5301, allocations: 2.349 MB / 0.7054 GB, free: 2.426 MB / 478.1 MB
Notification: Performance of postOpt solveSimpleEquations (initialization): time 0.0008136/0.5309, allocations: 143.8 kB / 0.7056 GB, free: 2.285 MB / 478.1 MB
Notification: Performance of postOpt calculateStrongComponentJacobians (initialization): time 0.03964/0.5706, allocations: 10.97 MB / 0.7163 GB, free: 7.215 MB / 494.1 MB
Notification: Performance of postOpt simplifyAllExpressions (initialization): time 0.001944/0.5725, allocations: 171.2 kB / 0.7165 GB, free: 7.047 MB / 494.1 MB
Notification: Performance of postOpt collapseArrayExpressions (initialization): time 0.0002951/0.5728, allocations: 39.98 kB / 0.7165 GB, free: 7.008 MB / 494.1 MB
Notification: Model statistics after passing the back-end for initialization:
 * Number of independent subsystems: 16
 * Number of states: 0 ()
 * Number of discrete variables: 0 ()
 * Number of discrete states: 0 ()
 * Number of clocked states: 0 ()
 * Top-level inputs: 0
Notification: Strong component statistics for initialization (83):
 * Single equations (assignments): 82
 * Array equations: 0
 * Algorithm blocks: 0
 * Record equations: 0
 * When equations: 0
 * If-equations: 0
 * Equation systems (not torn): 0
 * Torn equation systems: 1
 * Mixed (continuous/discrete) equation systems: 0
Notification: Torn system details for strict tearing set:
 * Linear torn systems (#iteration vars, #inner vars, density): 0 systems
 * Non-linear torn systems (#iteration vars, #inner vars): 1 system
   {(27,20)}
Notification: Performance of prepare postOptimizeDAE: time 0.0008508/0.5737, allocations: 233.6 kB / 0.7167 GB, free: 6.77 MB / 494.1 MB
Notification: Performance of postOpt lateInlineFunction (simulation): time 0.0005043/0.5742, allocations: 123.2 kB / 0.7168 GB, free: 6.648 MB / 494.1 MB
Notification: Performance of postOpt wrapFunctionCalls (simulation): time 0.01609/0.5903, allocations: 4.401 MB / 0.7211 GB, free: 2.234 MB / 494.1 MB
Notification: Performance of postOpt inlineArrayEqn (simulation): time 1.756e-05/0.5903, allocations: 8 kB / 0.7211 GB, free: 2.227 MB / 494.1 MB
Notification: Performance of postOpt constantLinearSystem (simulation): time 4.619e-06/0.5903, allocations: 0.875 kB / 0.7211 GB, free: 2.227 MB / 494.1 MB
Notification: Performance of postOpt simplifysemiLinear (simulation): time 2.853e-05/0.5903, allocations: 11.92 kB / 0.7211 GB, free: 2.215 MB / 494.1 MB
Notification: Performance of postOpt removeSimpleEquations (simulation): time 0.02022/0.6105, allocations: 5.397 MB / 0.7264 GB, free: 12.75 MB / 0.4981 GB
Notification: Performance of postOpt simplifyComplexFunction (simulation): time 1.334e-05/0.6106, allocations: 3.938 kB / 0.7264 GB, free: 12.75 MB / 0.4981 GB
Notification: Performance of postOpt solveSimpleEquations (simulation): time 0.0005398/0.6111, allocations: 87.91 kB / 0.7265 GB, free: 12.66 MB / 0.4981 GB
Notification: Performance of postOpt tearingSystem (simulation): time 0.007769/0.6189, allocations: 2.163 MB / 0.7286 GB, free: 10.5 MB / 0.4981 GB
Notification: Performance of postOpt inputDerivativesUsed (simulation): time 0.0002196/0.6191, allocations: 20.55 kB / 0.7286 GB, free: 10.48 MB / 0.4981 GB
Notification: Performance of postOpt calculateStrongComponentJacobians (simulation): time 0.02762/0.6467, allocations: 9.604 MB / 0.738 GB, free: 0.7578 MB / 0.4981 GB
Notification: Performance of postOpt calculateStateSetsJacobians (simulation): time 2.435e-06/0.6467, allocations: 0 / 0.738 GB, free: 0.7578 MB / 0.4981 GB
Notification: Performance of postOpt symbolicJacobian (simulation): time 0.01879/0.6655, allocations: 5.485 MB / 0.7434 GB, free: 11.25 MB / 0.5137 GB
Notification: Performance of postOpt removeConstants (simulation): time 0.0006259/0.6661, allocations: 143 kB / 0.7435 GB, free: 11.11 MB / 0.5137 GB
Notification: Performance of postOpt simplifyTimeIndepFuncCalls (simulation): time 0.000535/0.6667, allocations: 16 kB / 0.7435 GB, free: 11.09 MB / 0.5137 GB
Notification: Performance of postOpt simplifyAllExpressions (simulation): time 0.001627/0.6683, allocations: 103.9 kB / 0.7436 GB, free: 10.99 MB / 0.5137 GB
Notification: Performance of postOpt findZeroCrossings (simulation): time 0.0009671/0.6693, allocations: 246.2 kB / 0.7439 GB, free: 10.75 MB / 0.5137 GB
Notification: Performance of postOpt collapseArrayExpressions (simulation): time 0.0001704/0.6694, allocations: 24 kB / 0.7439 GB, free: 10.73 MB / 0.5137 GB
Notification: Performance of sorting global known variables: time 0.001131/0.6706, allocations: 0.6226 MB / 0.7445 GB, free: 10.09 MB / 0.5137 GB
Notification: Performance of sort global known variables: time 8.1e-08/0.6706, allocations: 0 / 0.7445 GB, free: 10.09 MB / 0.5137 GB
Notification: Performance of remove unused functions: time 0.001741/0.6723, allocations: 463.7 kB / 0.7449 GB, free: 9.641 MB / 0.5137 GB
Notification: Model statistics after passing the back-end for simulation:
 * Number of independent subsystems: 2
 * Number of states: 6 (gENCLS.delta,gENCLS.eq,gENCLS1.delta,gENCLS1.omega,gENCLS1.eq,gENCLS.omega)
 * Number of discrete variables: 0 ()
 * Number of discrete states: 0 ()
 * Number of clocked states: 0 ()
 * Top-level inputs: 0
Notification: Strong component statistics for simulation (55):
 * Single equations (assignments): 54
 * Array equations: 0
 * Algorithm blocks: 0
 * Record equations: 0
 * When equations: 0
 * If-equations: 0
 * Equation systems (not torn): 0
 * Torn equation systems: 1
 * Mixed (continuous/discrete) equation systems: 0
Notification: Torn system details for strict tearing set:
 * Linear torn systems (#iteration vars, #inner vars, density): 0 systems
 * Non-linear torn systems (#iteration vars, #inner vars): 1 system
   {(27,20)}
Notification: Performance of Backend phase and start with SimCode phase: time 0.01846/0.6908, allocations: 6.043 MB / 0.7508 GB, free: 3.562 MB / 0.5137 GB
Notification: Performance of simCode: created initialization part: time 0.008855/0.6996, allocations: 2.483 MB / 0.7533 GB, free: 1.074 MB / 0.5137 GB
Notification: Performance of simCode: created event and clocks part: time 5.18e-06/0.6996, allocations: 0 / 0.7533 GB, free: 1.074 MB / 0.5137 GB
Notification: Performance of simCode: created simulation system equations: time 0.006593/0.7062, allocations: 1.7 MB / 0.7549 GB, free: 15.36 MB / 0.5294 GB
Notification: Performance of simCode: created of all other equations (e.g. parameter, nominal, assert, etc): time 0.001691/0.7079, allocations: 100.8 kB / 0.755 GB, free: 15.27 MB / 0.5294 GB
Notification: Performance of simCode: created linear, non-linear and system jacobian parts: time 0.048/0.7559, allocations: 16.17 MB / 0.7708 GB, free: 14.89 MB / 0.545 GB
Notification: Performance of simCode: some other stuff during SimCode phase: time 0.0007987/0.7567, allocations: 0.5008 MB / 0.7713 GB, free: 14.35 MB / 0.545 GB
Notification: Performance of simCode: alias equations: time 0.0005153/0.7572, allocations: 90.91 kB / 0.7714 GB, free: 14.26 MB / 0.545 GB
Notification: Performance of simCode: all other stuff during SimCode phase: time 0.0008134/0.758, allocations: 423.3 kB / 0.7718 GB, free: 13.84 MB / 0.545 GB
Notification: Performance of SimCode: time 1.062e-06/0.758, allocations: 0 / 0.7718 GB, free: 13.84 MB / 0.545 GB
Notification: Performance of buildModelFMU: Generate the FMI files: time 0.1131/0.8712, allocations: 40.58 MB / 0.8114 GB, free: 5.211 MB / 0.5762 GB
Notification: Performance of buildModelFMU: Generate platform static: time 13.9/14.77, allocations: 7.438 kB / 0.8114 GB, free: 5.207 MB / 0.5762 GB
"
[Timeout remaining time 645]
(rm -f OpenIPSL_2.0.0_OpenIPSL.Tests.Machines.PSSE.GENCLS.pipe ; mkfifo OpenIPSL_2.0.0_OpenIPSL.Tests.Machines.PSSE.GENCLS.pipe ; head -c 1048576 < OpenIPSL_2.0.0_OpenIPSL.Tests.Machines.PSSE.GENCLS.pipe >> ../files/OpenIPSL_2.0.0_OpenIPSL.Tests.Machines.PSSE.GENCLS.sim & python3 -m fmpy simulate  --output-file OpenIPSL_2.0.0_OpenIPSL.Tests.Machines.PSSE.GENCLS_res.csv --start-time 0 --stop-time 10 --timeout 50 --relative-tolerance 1e-06 --interface-type ModelExchange --solver CVode --output-interval 0.004 OpenIPSL_2_0_0_OpenIPSL_Tests_Machines_PSSE_GENCLS.fmu > OpenIPSL_2.0.0_OpenIPSL.Tests.Machines.PSSE.GENCLS.pipe 2>&1) [Timeout 52.5]
[Calling sys.exit(0), Time elapsed: 18.188994748983532]
Failed to read output from testmodel.py, exit status != 0:
14.917492760811001 14.933986015 14.511372594
Calling exit ...
<OMPython.OMCSessionZMQ object at 0x7f4db5af2fb0>