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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def find_rt_coefficients_tot_intens(self, depth0=None):
 """Figure out total-intensity emission and absorption coefficients for the current parameters. **Argument** *depth0* (default None) A first guess to use for a good integration depth, in cm. If None, the most recent value is used. **Return value** A tuple ``(j_I, alpha_I)``, where: *j_I* The total intensity emission coefficient, in erg/s/cm^3/Hz/sr. *alpha_I* The total intensity absorption coefficient, in cm^-1. See :meth:`find_rt_coefficients` for an explanation how this routine works. This version merely postprocesses the results from that method to convert the coefficients to refer to total intensity. """

        j_O, alpha_O, j_X, alpha_X = self.find_rt_coefficients(depth0=depth0)
        j_I = j_O + j_X
        alpha_I = 0.5 * (alpha_O + alpha_X) # uhh... right?
        return (j_I, alpha_I)