Comparison of the column density map (top) and the corresponding local normalized column density image (bottom) on a high-density region of the Gp centred at (l, b) = 332°, 0°. Examples of high- and low-contrast filaments (see text) present on the original column density map (top) and their counterparts on the normalized map (bottom) are identified with cyan and yellow arrows, respectively. The original column density map is represented in logarithmic scale and spans the range 6 × 10²¹ to 1 × 10²³ cm⁻². The white and black squares on the original column density and normalized map, respectively, are saturated regions.