Correlation plot of the kinematic distances and gas masses for the ATLASGAL sources in the first quadrant as black triangles and the clumps in the fourth quadrant as red points. The curve shows a minimum 5σ detection. The upper panel illustrates the contour plot, for which we counted the number of sources in each kinematic distance bin of 2 kpc and each logarithmic gas mass bin of 0.25. The contours give 10 to 90% in steps of 20% of the peak source number per bin. The error bar displays the average distance and mass errors.