Some of the tracks in the UCSC browser are shown as spiky or 'grass-like' charts:
I can not find the documentation on how to create these kind of graphs. In the User Track documentation, there is the description of BED and GFF files; However, it seems that these can only be represented with different colors.
For example, the documentation for the 'score' attribute in BED doesn't say anything about the height of the ticks to be represented.:
How can I define the height of the ticks in a custom track for the UCSC browser? Which format should I use, BED, GFF or another?