Spatial binning scheme comparison for cluster 4 spectroscopic temperature map (keV) without background, at redshift z = 0.105. Top left: unbinned raw input map from the hydrodynamical simulation. Top right: voronoi tessellation map using the algorithms described in (Cappellari & Copin 2003). Bottom left: contour map using contbin tool (Sanders 2006) with an aspect ratio constraint, C_fill = 2. Bottom right: same as bottom left, with C_fill = 1.