Dispersion coordinates field image_Mrk 421_obsid_20716 Sky field image_Mrk 421_obsid_20716 Source region detail images_Mrk 421_obsid_20716 Light curve_Mrk 421_obsid_20716 Counts Spectrum (1)_Mrk 421_obsid_20716 Counts Spectrum (2)_Mrk 421_obsid_20716 Counts Spectrum (3)_Mrk 421_obsid_20716 Counts Spectrum (4)_Mrk 421_obsid_20716 Flux Preview_Mrk 421_obsid_20716