[Amps] Bird Slug Frequency Curves

[Richard Solomon]

I once saw a set of curves that plots frequency vs accuracy
for various power level Bird Slugs.

It was to be used if you wanted to operate a slug outside the
stated frequency limits.

Does anyone know where I can find it ?

For the short test I want to make, buying a 2500B doesn't
make sense when I have a 2500C.

Thanks, Dick, W1KSZ