 y scale so that zero is in the centre. Defaults to FALSE.</p></dd>


<dt>y_breaks_n</dt>
<dd><p>For a numeric or date y variable, the desired number of intervals on the y scale, as calculated by the pretty algorithm. Defaults to 5.</p></dd>


<dt>y_expand</dt>
<dd><p>A vector of range expansion constants used to add padding to the y scale, as per the ggplot2 expand argument in ggplot2 scales functions.</p></dd>


<dt>y_labels</dt>
<dd><p>A function or named vector to modify y scale labels. If NULL, categor