Terzan 2     c
 2 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)=     2.167 +-  0.134
 a(1)=     2.665 +-  0.205
 a(2)=     0.260 +-  0.189
Power-of-x coeffients a(0)+a(1)x+a(2)x^2+..., where x=r
 a(0)=    -1.0383
 a(1)=     1.6504
 a(2)=     0.4387
log r(arcsec)   mu_V    mu_V(fitted)  residual   weight  data set