Dispersion coordinates field image_Mrk 421_obsid_15483 Sky field image_Mrk 421_obsid_15483 Source region detail images_Mrk 421_obsid_15483 Light curve_Mrk 421_obsid_15483 Counts Spectrum (1)_Mrk 421_obsid_15483 Counts Spectrum (2)_Mrk 421_obsid_15483 Counts Spectrum (3)_Mrk 421_obsid_15483 Counts Spectrum (4)_Mrk 421_obsid_15483 Flux Preview_Mrk 421_obsid_15483