Order-sorting image_Mrk 421_obsid_28668 Dispersion coordinates field image_Mrk 421_obsid_28668 Sky field image_Mrk 421_obsid_28668 Source region detail images_Mrk 421_obsid_28668 Light curve_Mrk 421_obsid_28668 Flux spectrum (1)_Mrk 421_obsid_28668 Flux spectrum (2)_Mrk 421_obsid_28668 Counts spectrum_Mrk 421_obsid_28668 Flux Preview_Mrk 421_obsid_28668