(a)–(b) Isodensity contours of the surface density
, equation (28). (a) Parameters: c/a = 1 and ɛ = 2. (b) Parameters: c/a = 1 and ɛ = 0. (c)–(d) Isopotential contours of the transformed potential
for the same parameters as in (a)–(b), respectively.