Order-sorting image_Mrk 421_obsid_21826 Dispersion coordinates field image_Mrk 421_obsid_21826 Sky field image_Mrk 421_obsid_21826 Source region detail images_Mrk 421_obsid_21826 Light curve_Mrk 421_obsid_21826 Flux spectrum (1)_Mrk 421_obsid_21826 Flux spectrum (2)_Mrk 421_obsid_21826 Counts spectrum_Mrk 421_obsid_21826 Flux Preview_Mrk 421_obsid_21826