https://www.aanda.org/articles/aa/abs/2014/06/aa22517-13/aa22517-13.html
HALOGAS observations of NGC 4414: fountains, interaction, and ram pressure | Astronomy &...
ngc 4414ram pressureobservations
https://www.planetary.org/space-images/ngc-4414-high-contrast-negative-view
NGC 4414 (high contrast, negative view) | The Planetary Society
This high contrast, negative view of the unbarred spiral galaxy NGC 4414 better shows the structure of the galaxy and its shell of stars.
ngc 4414high contrastview thenegativeplanetary