NGC5286
 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)=    19.652 +-  0.153
 a(1)=     4.280 +-  0.254
 a(2)=     0.842 +-  0.186
Power-of-x coeffients a(0)+a(1)x+a(2)x^2+..., where x=1+(r/r_c), r_c=1.20
 a(0)=     6.3875
 a(1)=     0.5650
 a(2)=     0.6510
log r(arcsec)   mu_V    mu_V(fitted)  residual   weight  data set