Training set for the IAE model for the emission spectra from collisionally ionized hot gas around the Fe K line. There are two underlying physical parameters: temperature, varying between [0.8 keV, 6 keV], and redshift, varying between [−0.033,+0.033]. Anchor points are in color: red is for the lowest temperature, lowest redshift. Purple shows the highest temperature, lowest redshift. Blue is for the highest temperature, highest redshift.