I don't think I am doing this correctly and need some help. I want
to have 3 different formulas for DELTA_T available in my guide.dat
file. The entry I currently have for DELTA_T from that file is:

DELTA_T=2002,100000:63.829,17.325,32.5
DELTA_T=#-10000,10000:63.829,88.51,25.77 # Larry Dart's
DELTA_T=#-10000,10000:63.829,0.0,0.0 # Constant value

I thought that the # commented out the line so that, in the above
example, only the first formula would be used by Guide8. If I
comment out the first two lines and uncomment the third, however, I
don't get a constant value for DELTA_T like I would expect from the
third formula.

What is the correct way to set this up so that I can choose among
alternative formulas by editing the comments in my guide.dat file?