olumn name giving the longitude. The x coordinate can be used instead of longitude.</p></dd>


<dt>t_col</dt>
<dd><p>For dataframes: the time column. Time must be a set of discrete integer values.</p></dd>


<dt>z_col</dt>
<dd><p>For dataframes: the The quantity of interest that will be plotted. Eg. temperature.</p></dd>


<dt>ifxy</dt>
<dd><p>For dataframes: if <code>TRUE</code> then the country borders are not drawn as longitude and latitude are unknown.</p></dd>

</dl></div>
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