NGC5053
 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)=    24.653 +-  0.151
 a(1)=     3.370 +-  0.249
 a(2)=     0.890 +-  0.218
 a(3)=     0.147 +-  0.176
Power-of-x coeffients a(0)+a(1)x+a(2)x^2+..., where x=1+(r/r_c)^2, r_c=2.17
 a(0)=     9.6986
 a(1)=     1.2125
 a(2)=     0.0130
 a(3)=     0.7169
log r(arcsec)   mu_V    mu_V(fitted)  residual   weight  data set