NGC6287
 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)=    20.532 +-  0.130
 a(1)=     2.578 +-  0.219
 a(2)=     0.407 +-  0.198
 a(3)=     0.134 +-  0.175
 a(4)=    -0.148 +-  0.147
Power-of-x coeffients a(0)+a(1)x+a(2)x^2+..., where x=1+(r/r_c)^2, r_c=1.21
 a(0)=     7.8080
 a(1)=     3.7931
 a(2)=    -4.7032
 a(3)=     3.0799
 a(4)=    -0.5772
log r(arcsec)   mu_V    mu_V(fitted)  residual   weight  data set