Palomar 8
 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)=    21.462 +-  0.163
 a(1)=     1.770 +-  0.262
 a(2)=     0.310 +-  0.198
Power-of-x coeffients a(0)+a(1)x+a(2)x^2+..., where x=1+(r/r_c)^2, r_c=1.44
 a(0)=     9.2706
 a(1)=     0.4900
 a(2)=     0.5305
log r(arcsec)   mu_V    mu_V(fitted)  residual   weight  data set