NGC6093 (M80)
18 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)=    20.208 +-  0.122
 a(1)=     5.967 +-  0.197
 a(2)=     1.136 +-  0.134
Power-of-x coeffients a(0)+a(1)x+a(2)x^2+..., where x=1+(r/r_c)^2, r_c=0.94
 a(0)=     5.2704
 a(1)=     0.6739
 a(2)=     0.5140
log r(arcsec)   mu_V    mu_V(fitted)  residual   weight  data set