NGC4590
 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)=    23.430 +-  0.153
 a(1)=     5.562 +-  0.260
 a(2)=     0.759 +-  0.198
 a(3)=    -0.206 +-  0.140
Power-of-x coeffients a(0)+a(1)x+a(2)x^2+..., where x=1+(r/r_c)^2, r_c=1.64
 a(0)=     7.1182
 a(1)=     0.3827
 a(2)=     1.3127
 a(3)=    -0.1554
log r(arcsec)   mu_V    mu_V(fitted)  residual   weight  data set