gas.py 文件源码

def column_density(self, rho, eph=None):
        """Coma column density at a projected distance from nucleus.

        Parameters
        ----------
        rho : `~astropy.units.Quantity`
          Projected distance of the region of interest on the plane of
          the sky in units of length or angle.

        eph : dictionary-like or `~sbpy.data.Ephem`
          Ephemerides at epoch; requires geocentric distance as
          `delta` keyword if aperture has angular units.


        Returns
        -------
        sigma : float

        """
        pass