def dlrfl_dx(self, x_surface, geom):
'''Partial derivative of Lambertian reflectance with respect to state
vector, calculated at x_surface.'''
dlrfl = MultiComponentSurface.dlrfl_dx(self, x_surface, geom)
dlrfl[:, self.bb_frac_ind] = 0
dlrfl[:, self.surf_temp_ind] = 0
return dlrfl
def dlrfl_dx(self, x_surface, geom):
'''Partial derivative of reflectance with respect to state vector,
calculated at x_surface.'''
return MultiComponentSurface.dlrfl_dx(self, x_surface, geom)
