def getTimeP(self, timeMesh):
        if self.rxType in ['dbxdt','dbydt','dbzdt']:
            return timeMesh.getInterpolationMat(self.times, self.projTLoc)*timeMesh.faceDiv
        else:
            return timeMesh.getInterpolationMat(self.times, self.projTLoc)
copy all flowspace fields from from_fs to to_fs
dataset/ETHPy150Open simpeg/simpeg/SimPEG/EM/TDEM/SurveyTDEM.py/RxTDEM.getTimeP--crossover with--dataset/ETHPy150Open fp7-ofelia/ocf/optin_manager/src/python/openflow/optin_manager/flowspace/helper.py/copy_fs