NGC2808
 8 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)=    20.279 +-  0.104
 a(1)=     6.187 +-  0.169
 a(2)=     1.078 +-  0.109
Power-of-x coeffients a(0)+a(1)x+a(2)x^2+..., where x=1+(r/r_c)^2, r_c=1.29
 a(0)=     5.0310
 a(1)=     0.9984
 a(2)=     0.6136
log r(arcsec)   mu_V    mu_V(fitted)  residual   weight  data set