Data information for the k-means clustering. Top: Joint-PDF of all the calibrated Mg II h&k line profiles in CGS units (erg cm⁻² s⁻¹ sr⁻¹ Hz⁻¹) within the sub-FoV of Fig. 1 for the four rasters. The corresponding average profile is shown as a dashed line. Bottom: Behavior of the inertia of the k-means method with increasing clusters to choose a suitable number through the elbow technique for raster 1 (red square), raster 2 (blue triangle), raster 3 (green circle), and raster 4 (black line). Our cluster choice for all the rasters, k = 160, is indicated by the vertical line.