 Use "" if you would like no title.</p></dd>


<dt>x_title_wrap</dt>
<dd><p>Number of characters to wrap the x title to. Defaults to 50.</p></dd>


<dt>y_zero_mid</dt>
<dd><p>For a numeric y variable, add balance to the y scale so that zero is in the centre of the y scale.</p></dd>


<dt>y_breaks_n</dt>
<dd><p>For a numeric or date x variable, the desired number of intervals on the x scale, as calculated by the pretty algorithm. Defaults to 4.</p></dd>


<dt>y_expand</dt>
<dd><p>A vector of range expansion 