code: def _jmomentsurfaceIntegrand(vz,vR,vT,R,z,df,sigmaR1,gamma,sigmaz1,n,m,o): #pragma: no cover because this is too slow; a warning is shown
      
      return df(R,vR*sigmaR1,vT*sigmaR1*gamma,z,vz*sigmaz1,use_physical=False,
                func= (lambda x,y,z: x**n*y**m*z**o))
docs: Internal function that is the integrand for the vmomentsurface mass integration