Left: distribution of regions for which the mutual information has been computed, where the inset indicates the number of observations inside the regions. The regions are circles in l−sinb space, with the positive b region in solid and its symmetric counterpart in dashed. Regions that are compared and are not symmetric are connected by a grey line. Right: average deviation of the mutual information between a region and its counterpart, in (red) blue for (non-) symmetric counterparts.