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track kerning

Hi,

apologizing that my question is a bit off-topic -- it is not 
special for TeX.

I found the following piece of information in an afm file:

StartTrackKern 3
TrackKern -1 6 0.10 144 -2.09
TrackKern -2 6 0.05 144 -4.02
TrackKern -3 6 0.00 144 -5.96

I know that this means, that letterspacing should vary with
font size.  However, what does this mean _quantitatively_?
How do I have to read this information?

TIA

Walter