NGC6325       c
 8 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)=    20.520 +-  0.190
 a(1)=     3.833 +-  0.337
 a(2)=     1.025 +-  0.297
 a(3)=     0.369 +-  0.213
 a(4)=     0.236 +-  0.185
Power-of-x coeffients a(0)+a(1)x+a(2)x^2+..., where x=r
 a(0)=     7.5521
 a(1)=     1.5616
 a(2)=     1.7614
 a(3)=    -1.9418
 a(4)=     0.7332
log r(arcsec)   mu_V    mu_V(fitted)  residual   weight  data set