Green line image (continuum not removed) - filter incidence = 0 °:


7 x 5 s exposure
Flat and dark corrected image - Gauss equalized visualisation


7 x 5 s exposure
Flat and dark corrected image - Radial gradient removed - Histogram equalisation visualisation



7 x 5 s exposure
Flat and dark corrected image - Radial gradient removed - Linear visualisation