Palomar 13
21 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)=    25.719 +-  0.339
 a(1)=     1.967 +-  0.517
 a(2)=     0.600 +-  0.436
Power-of-x coeffients a(0)+a(1)x+a(2)x^2+..., where x=1+(r/r_c)^2, r_c=1.20
 a(0)=    11.7005
 a(1)=    -1.4600
 a(2)=     2.1575
log r(arcsec)   mu_V    mu_V(fitted)  residual   weight  data set