From patience but done. Suggestive of other contours.
Hyper fast Perimeter & Area added as needed for purpose.

Digitize Contour Isocurve Himmelblau.sm (70 KiB) downloaded 83 time(s).

Wrote

From patience but done. Suggestive of other contours.
Hyper fast Perimeter

... same up to including ordered.
Added:
1. Centered ... 2. Esplina ... 3. Hermite.
For you convenience: the *.bmp to download
and read gray:= "read from your file system".
All in all, Smath can digitize some precious/clean
from web source or else compatible *.bmp composition.


Digitize Contour Isocurve Himmelblau.sm (160 KiB) downloaded 59 time(s).