NGC7006
 4 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)=    22.082 +-  0.148
 a(1)=     4.338 +-  0.243
 a(2)=     0.644 +-  0.204
 a(3)=    -0.281 +-  0.169
Power-of-x coeffients a(0)+a(1)x+a(2)x^2+..., where x=1+(r/r_c), r_c=1.06
 a(0)=     7.6292
 a(1)=    -0.5063
 a(2)=     1.9577
 a(3)=    -0.3056
log r(arcsec)   mu_V    mu_V(fitted)  residual   weight  data set