Fluxes are not yet post-processable as 3D fields. However you can post-process them in off-line mode5.1 by activating the pronostic field for gridpoint cloud fraction (setting (LGPA=.TRUE.)) and feeding the cloud fraction with one of them through a proper setting of TFP_CLF%CLNAME. Notice : this is possible only because there is -- by "chance" ! -- no control of the interpolations overshoot for cloud fraction (In principle the interpolated cloud fraction should be controlled in order to remain between 0. and 1.).