HP            c
 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)=     2.345 +-  0.099
 a(1)=     2.538 +-  0.149
 a(2)=     0.045 +-  0.142
Power-of-x coeffients a(0)+a(1)x+a(2)x^2+..., where x=r
 a(0)=    -0.9424
 a(1)=     2.1064
 a(2)=     0.0707
log r(arcsec)   mu_V    mu_V(fitted)  residual   weight  data set