NGC6229
13 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)=    21.136 +-  0.128
 a(1)=     5.320 +-  0.212
 a(2)=     0.960 +-  0.157
Power-of-x coeffients a(0)+a(1)x+a(2)x^2+..., where x=1+(r/r_c)^2, r_c=0.95
 a(0)=     6.2074
 a(1)=     0.8512
 a(2)=     0.6374
log r(arcsec)   mu_V    mu_V(fitted)  residual   weight  data set