Order-sorting image_Mrk 421_obsid_27928 Dispersion coordinates field image_Mrk 421_obsid_27928 Sky field image_Mrk 421_obsid_27928 Source region detail images_Mrk 421_obsid_27928 Light curve_Mrk 421_obsid_27928 Flux spectrum (1)_Mrk 421_obsid_27928 Flux spectrum (2)_Mrk 421_obsid_27928 Counts spectrum_Mrk 421_obsid_27928 Flux Preview_Mrk 421_obsid_27928