NGC6256       c
 7 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)=    20.628 +-  0.190
 a(1)=     3.133 +-  0.341
 a(2)=     0.320 +-  0.301
 a(3)=     0.177 +-  0.233
 a(4)=     0.313 +-  0.185
Power-of-x coeffients a(0)+a(1)x+a(2)x^2+..., where x=r
 a(0)=     7.9216
 a(1)=     2.3251
 a(2)=     2.8227
 a(3)=    -3.6585
 a(4)=     1.2046
log r(arcsec)   mu_V    mu_V(fitted)  residual   weight  data set