GDIGS RRL spectra toward G15.85+0.10 (left), G24.07−0.59 (center), and G31.00−0.91 (right) using three different beam sizes, ﹩36^{\prime} ﹩, ﹩16^{\prime} ﹩, and ﹩2\mathop{.}\limits{^{\prime} }65﹩. From top to bottom each row shows the GDIGS spectra at ﹩36^{\prime} ﹩ resolution, the GDIGS spectra at ﹩16^{\prime} ﹩ resolution, the difference between the GDIGS spectra at ﹩36^{\prime} ﹩ and ﹩16^{\prime} ﹩ resolutions, the GDIGS spectra at ﹩2\mathop{.}\limits{^{\prime} }65﹩ resolution, and the difference between the GDIGS spectra at ﹩16^{\prime} ﹩ and ﹩2\mathop{.}\limits{^{\prime} }65﹩ resolutions. The dotted lines show the 3σ rms of the differences. No scaling has been applied to compute the differences.