They are the filters used in the observation. Telescopes use filters to select a range of light wavelength/frequency to be observed. See http://svo2.cab.inta-csic.es/svo/theory/fps3/index.php?id=JW... to see their properties.

They are "mask" which only allow some wavelengths so you can see different structure.

https://en.wikipedia.org/wiki/Coronagraph