which dimensions in the input matrix correspond to the independent coordinate, the different datasets, and the ensembles per dataset, respectively.  The default is 'xye'.</p><p><tt>ensemble2bnd(..., 'center', center)</tt> switches the center-line statistic between the 'mean' (default) and 'median' of each dataset.</p><p><tt>ensemble2bnd(..., 'prc', prc)</tt> specifies the percentile values corresponding to lower and upper bounds.  These should come in pairs, from lowest to highest percentile.  The default i