Top panels: integrated intensity maps of C¹⁸O and HCN emission lines wavelet-filtered on scale of l = 18 arcmin (left and right panels, respectively). Bottom left: product map generated by multiplying the two wavelet-filtered maps (top panels). Bottom right: shifted product map of the top left and top right maps where the latter one is shifted by measured offset in the north-east direction (τ_x = −2.8 arcmin and τ_y = 4.5 arcmin). Note the increase of the signal for the shifted combination compared to the direct product.