NGC6355       c
 6 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)=    19.647 +-  0.192
 a(1)=     2.648 +-  0.355
 a(2)=     0.838 +-  0.305
 a(3)=     0.158 +-  0.275
 a(4)=     0.054 +-  0.208
 a(5)=    -0.115 +-  0.194
Power-of-x coeffients a(0)+a(1)x+a(2)x^2+..., where x=r
 a(0)=     7.9331
 a(1)=     1.1232
 a(2)=     1.8937
 a(3)=    -4.2516
 a(4)=     3.3115
 a(5)=    -0.7352
log r(arcsec)   mu_V    mu_V(fitted)  residual   weight  data set