IC4499
21 iterations.
Chebyshev coeffients a(0)T_0(u)+a(1)T_1(u)+..., where u is log (r/arcsec) mapped to [-1,1]
 a(0)=    23.753 +-  0.234
 a(1)=     3.311 +-  0.370
 a(2)=     0.480 +-  0.328
Power-of-x coeffients a(0)+a(1)x+a(2)x^2+..., where x=1+(r/r_c)^2, r_c=1.88
 a(0)=     9.0307
 a(1)=     1.2323
 a(2)=     0.7757
log r(arcsec)   mu_V    mu_V(fitted)  residual   weight  data set