ic_fu_tau scaleddelta-scaling is switched on, with
ic_fu_tau unscaledit is switched off. The default is without delta-scaling. Please note that this was changed on July 22, 2008: Before, delta-scaling was switched on by default which might have caused some confusion, because irradiance calculations were not consistent with the other ice cloud parameterizations implemented in uvspec. Using the Fu (1996) parameterization in combination with one of ic_set_tau/tau550/gg/ssa or ic_scale_gg/ssa you now get consistent results with all other ice cloud parameterizations.