def _vmomentsurfaceMCIntegrand(vz,vR,vT,R,z,df,sigmaR1,gamma,sigmaz1,mvT,n,m,o):
    """Internal function that is the integrand for the vmomentsurface mass integration"""
    return vR**n*vT**m*vz**o*df(R,vR*sigmaR1,vT*sigmaR1*gamma,z,vz*sigmaz1,use_physical=False)*numpy.exp(vR**2./2.+(vT-mvT)**2./2.+vz**2./2.)