Standard parallels in the image:
90° North, 30° South.
This configuration was set to achieve a result that is comparable to the configuration of Lambert equal-area conic that is shown here on the site.
It probably has no practical use, that’s why I chose the name affix CM for compare-maps.net.
Equidistant conic projections can be traced back at least to Ptolemy.
Jump to different depiction of this projection:
Specified in [square brackets]: Actual size of the projection
(minus the black or white background). When marked with [≈], sizes with and without
background are approx. the same.