This directory contains files for a comparison of the old iup forward model and the new arts one, especially for the oxygen cluster around 60 and at 118 GHz. Catalogues: o2_spin_rot.my2 : from hitran, 51- to 51+ line o2_spin_rot_2.my2 : all lines from hitran within the frequency range 40 - 120 GHz Controlfiles: o2_spin_rot.ctl : control file of old iup forward o2_spin_rot.arts : control file of arts