Herschel} mission, which covered around 1300~$\rm deg^2$ on the sky.

HELP systematically combines data from 23 of the premier extragalactic survey fields. It compiles

all the ancillary data that are available across the HELP fields into a catalogue

with consistent photometry, from the best photometric catalogues that are

available. We

performed the spectral energy distribution (SED) fitting of millions of HELP galaxies across a wide

redshift range to obtain homogeneous estimates of the main physical parameters of detected infrared

(IR) galaxies. Here we are going to present the results of the SED fitting, based on the

pilot HELP

field: ELAIS~N1, and and the very well known COSMOS field. We deliver the main physical

parameters

such as stellar mass, star formation rate, and dust luminosity by assuming three different dust

attenuation laws, separately. This exercise allows us to test the impact of the assumed

attenuation

law on estimated physical parameters.

We find that the attenuation law has almost no impact on derived star formation rate (if the

far IR

data is used for the SED fitting) and the dust luminosity, but it has an important impact on the

stellar mass estimate. We find a systematic shift between stellar masses obtained with different

attenuation laws. We derive the relation between stellar mass estimates obtained by three different

attenuation laws.