def _compute_weight_std(self, C, mag):
        """
        Common part of equations 8 and 9, page 971.
        """
        if mag < 6.0:
            return C['a1']
        elif mag >= 6.0 and mag < 6.5:
            return C['a1'] + (C['a2'] - C['a1']) * ((mag - 6.0) / 0.5)
        else:
            return C['a2']
def _compute_weight_std ( self , C , mag ) : if mag < 6.0 : return C [ 'a1' ] elif mag >= 6.0 and mag < 6.5 : return C [ 'a1' ] + ( C [ 'a2' ] - C [ 'a1' ] ) * ( ( mag - 6.0 ) / 0.5 ) else : return C [ 'a2' ]
Common part of equations 8 and 9, page 971.