NGC6535
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)=    23.185 +-  0.209
 a(1)=     2.358 +-  0.321
 a(2)=     0.335 +-  0.298
 a(3)=    -0.122 +-  0.242
Power-of-x coeffients a(0)+a(1)x+a(2)x^2+..., where x=1+(r/r_c), r_c=1.35
 a(0)=     9.6913
 a(1)=    -0.0735
 a(2)=     1.7036
 a(3)=    -0.3481
log r(arcsec)   mu_V    mu_V(fitted)  residual   weight  data set