table colgroup col width

[slowkow]

I made a table in a file vignettes/examples.Rmd. I'm not happy with the width of the columns.

Specifically, the first column is set to 20% but I would like it to be 25%.

<table class="table">
<colgroup>
<col width="20%">
<col width="16%">
<col width="64%">
</colgroup>

Questions:

1. How are these percentages calculated?
2. How can I override the defaults with my own preferences?

[hadley]

I suspect its pandoc doing this, well before it gets to pandoc — you might try looking at the rendered vignette locally.