def pl2_to_pl(src_dict, scale=1000.):
    """Convert integral flux of PL2 to prefactor of PL"""
    index = src_dict['spectral_pars']['Index']['value']
    emin = src_dict['spectral_pars']['LowerLimit']['value']
    emax = src_dict['spectral_pars']['UpperLimit']['value']
    f = src_dict['spectral_pars']['Integral']['value']

    prefactor = f * (1. - index) 
    prefactor /= (emax ** (1. - index) - emin ** (1. - index))
    prefactor *= scale ** -index
    return prefactor