NGC1261         
 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)=    21.291 +-  0.146
 a(1)=     4.507 +-  0.254
 a(2)=     0.937 +-  0.179
Power-of-x coeffients a(0)+a(1)x+a(2)x^2+..., where x=1+(r/r_c)^2, r_c= 1.37
 a(0)=     7.0745
 a(1)=     0.5453
 a(2)=     0.9636
log r(arcsec)   mu_V    mu_V(fitted)  residual   weight  data set