Make right hand side of the tree plot more visible

[durszlaczek]

The most interesting part of the merging path is usually on the right hand side of the tree plot. Loglikelihood varies only slightly for early models and it's hard to see the correct order of merging in the plot.
Maybe x axis of the plot should be in the logarithmic scale?

[pbiecek]

isn't it a loglikelihood already?
In some cases, it may be negative
The easiest solution is to add a xlim argument that can be passed to ggplot2

[durszlaczek]

Yes, using external argument for scaling x axis sounds good