NGC6453       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)=    19.054 +-  0.093
 a(1)=     2.583 +-  0.195
 a(2)=     0.779 +-  0.130
 a(3)=    -0.214 +-  0.130
Power-of-x coeffients a(0)+a(1)x+a(2)x^2+..., where x=r
 a(0)=     7.5505
 a(1)=     0.2185
 a(2)=     1.8308
 a(3)=    -0.3779
log r(arcsec)   mu_V    mu_V(fitted)  residual   weight  data set