quires to convert [‘mm’,’mm’,’um’] to [‘um’,’um’,’um’]</p>
<p>If default, units are built from vars and from strings obtained from <cite>dataIO.arrays.stats</cite> (called without data).</p>
<p>TODO: span doesn’t exclude nan data, put flag to tune this option.
TODO: there is some confusion in creating labels for <cite>plot_data</cite> because it can be unclear which one is X, Y, Z. A label should be added externally or in a routine. Also, statistics cannot be sorted (a list is retu