Squeezing tracks closer together

[lmorris99]

I can change theme.event.track.height, track.gap, and tape.height.
They all seem to have some effect, but when I try to set track.gap very small, it refuses: ie, the tracks still are farther apart in vertical separation than I wat.

Did the name change to maxgap or something?
And where is the reference documentation on events, please?
I found this for themes: http://www.simile-widgets.org/wiki/Timeline_ThemeClass
but nothing similar for events.

Thanks...