Palomar 14  (1609+15)
 3 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)=     1.077 +-  0.350
 a(1)=     1.676 +-  0.539
 a(2)=     0.445 +-  0.493
Power-of-x coeffients a(0)+a(1)x+a(2)x^2+..., where x=1+(r/r_c)^2, r_c=1.61
 a(0)=    -0.6849
 a(1)=    -0.2194
 a(2)=     1.2150
log r(arcsec)   mu_V    mu_V(fitted)  residual   weight  data set