Terzan 9      c
 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)=     2.210 +-  0.142
 a(1)=     2.386 +-  0.238
 a(2)=     0.307 +-  0.202
 a(3)=     0.135 +-  0.187
Power-of-x coeffients a(0)+a(1)x+a(2)x^2+..., where x=r
 a(0)=    -0.7127
 a(1)=     2.0477
 a(2)=    -0.7023
 a(3)=     0.5277
log r(arcsec)   mu_V    mu_V(fitted)  residual   weight  data set