\begin{table}%t2
\caption{\label{tsample}Observed sample.}
%\centering
\par
\begin{tabular}{lcccccclc}
\hline \hline \noalign{\smallskip}
Source & $\alpha$ & $\delta$ & $d$ & $V_{{\rm LSR}}$ & $M$ & $\Sigma$ & Survey & Sub-sample\\
 & (J2000) & (J2000) & (kpc) & (km~s$^{-1}$) & ($M_{\odot}$) & (g~cm$^{-2}$) & &  \\
 \hline
05358+3543 & 05:39:12.20 & +35:45:52.0 & 1.8 & $-$18 & 127 & 0.84 & Beuther & IR-loud\\
G213.61$-$12.6 & 06:07:47.90 & $-$06:22:57.0 & 2.1 & +12 & 1800 & 0.78 & Hill & IR-loud\\
G189.78+0.34 & 06:08:34.50 & +20:38:51.0 & 1.8 & +6 & 150 & 0.40 & Hill & IR-loud\\
G192.58--0.04 & 06:12:52.90 & +18:00:35.0 & 2.6 & +8 & 500 & 0.47 & Hill & IR-loud\\
G192.60--0.05 & 06:12:54.00 & +17:59:23.0 & 2.6 & +8 & 460 & 0.63 & Hill & IR-loud\\
G192.59--0.04 & 06:12:54.00 & +17:59:47.0 & 2.6 & +8 & 310 & 1.60 & Hill & IR-loud\\
 18151--1208\_2 & 18:17:50.50 & $-$12:07:55.0 & 3.0 & +33 & 475 & 0.90 & Beuther & IR-dark\\
 18151--1208\_3 & 18:17:52.30 & $-$12:06:56.0 & 3.0 & +33 & 53 & 0.08 & Beuther & IR-loud\\
 18151--1208\_1 & 18:17:58.00 & $-$12:07:27.0 & 3.0 & +33 & 211 & 0.63 & Beuther & IR-loud\\
 G18.15$-$0.28 & 18:25:01.30 & $-$13:15:35.0 & 2.6 & +55 & 280 & 0.13 & Hill & IR-loud\\
 G18.18--0.30 & 18:25:07.30 & $-$13:14:23.0 & 2.6 & +55 & 110 & 0.22 & Hill & IR-loud\\
 18223$-$1243 & 18:25:10.87 & $-$12:42:26.8 & 3.7 & +45 & 980 & 0.13 & Fa\'undez & IR-loud\\
 18228$-$1312 & 18:25:42.35 & $-$13:10:18.1 & 3.0 & +33 & 740 & 0.16 & Fa\'undez & IR-loud\\
 G19.27+0.1M2 & 18:25:52.60 & $-$12:04:48.0 & 2.4 & +26 & 114 & 0.18 & Rathborne & IR-dark\\
 G19.27+0.1M1 & 18:25:58.50 & $-$12:03:59.0 & 2.4 & +26 & 113 & 0.33 & Rathborne & IR-dark\\
 18236$-$1205 & 18:26:25.41 & $-$12:03:51.4 & 2.5 & +26 & 780 & 0.22 & Fa\'undez & IR-loud\\
 18264$-$1152 & 18:29:14.40 & $-$11:50:21.3 & 3.5 & +44 & 1100 & 0.36 & Fa\'undez & IR-loud\\
 G23.60+0.0M1 & 18:34:11.60 & $-$08:19:06.0 & 3.9 & +54 & 365 & 1.01 & Rathborne & IR-dark\\
 18316$-$0602 & 18:34:20.46 & $-$05:59:30.4 & 3.1 & +41 & 1000 & 0.29 & Fa\'undez & IR-loud\\
 G23.60+0.0M2 & 18:34:21.10 & $-$08:18:07.0 & 3.9 & +54 & 233 & 0.74 & Rathborne & IR-dark\\
 18317$-$0513 & 18:34:25.94 & $-$05:10:48.6 & 3.2 & +42 & 770 & 0.17 & Fa\'undez & IR-loud\\
 G24.08+0.0M2 & 18:34:51.10 & $-$07:45:32.0 & 3.8 & +54 & 201 & 0.11 & Rathborne & IR-dark\\
 G24.33+0.1M1 & 18:35:07.90 & $-$07:35:04.0 & 3.8 & +53 & 1759 & 14.44 & Rathborne & IR-dark\\
 G24.33+0.1M4 & 18:35:19.40 & $-$07:37:17.0 & 3.8 & +53 & 446 & 0.16 & Rathborne & IR-dark\\
 G24.33+0.1M2 & 18:35:34.50 & $-$07:37:28.0 & 3.8 & +53 & 123 & 0.20 & Rathborne & IR-dark\\
 G24.60+0.1M2 & 18:35:35.70 & $-$07:18:09.0 & 3.7 & +52 & 483 & 0.73 & Rathborne & IR-dark\\
 G24.60+0.1M1 & 18:35:40.20 & $-$07:18:37.0 & 3.7 & +52 & 192 & 0.82 & Rathborne & IR-dark\\
 G25.04$-$0.2M1 & 18:38:10.20 & $-$07:02:34.0 & 3.4 & +47 & 276 & 0.42 & Rathborne & IR-dark\\
 G25.04$-$0.2M4 & 18:38:13.70 & $-$07:03:12.0 & 3.4 & +47 & 307 & 0.15 & Rathborne & IR-dark\\
 G25.04$-$0.2M2 & 18:38:17.70 & $-$07:02:51.0 & 3.4 & +47 & 104 & 0.16 & Rathborne & IR-dark\\
 G28.28$-$0.35 & 18:44:14.20 & $-$04:17:59.0 & 2.8 & +48 & 650 & 0.23 & Hill & IR-loud\\
 18507+0121 & 18:53:18.00 & +01:25:00.6 & 3.7 & +57 & 2000 & 0.20 & Fa\'undez & IR-loud\\
 G34.43+0.2M1 & 18:53:18.00 & +01:25:24.0 & 3.7 & +57 & 1187 & 8.75 & Rathborne & IR-dark\\
 G34.43+0.2M3 & 18:53:20.40 & +01:28:23.0 & 3.7 & +57 & 301 & 0.55 & Rathborne & IR-dark\\
 G34.24+0.13 & 18:53:21.70 & +01:13:37.0 & 3.5 & +55 & 140 & 0.14 & Hill & IR-loud\\
 18517+0437 & 18:54:14.30 & +04:41:40.0 & 2.9 & +44 & 504 & 0.80 & Beuther & IR-loud\\
 G34.77$-$0.6M2 & 18:56:50.30 & +01:23:16.0 & 2.9 & +44 & 188 & 0.11 & Rathborne & IR-dark\\
 G35.39$-$0.3M4 & 18:57:06.70 & +02:08:23.0 & 2.9 & +45 & 108 & 0.14 & Rathborne & IR-dark\\
 G38.95$-$0.5M1 & 19:04:07.40 & +05:08:48.0 & 2.7 & +42 & 117 & 0.25 & Rathborne & IR-dark\\
 19035+0641 & 19:06:01.60 & +06:46:43.0 & 2.2 & +32 & 185 & 0.43 & Beuther & IR-loud\\
 19095+0930 & 19:11:54.02 & +09:35:52.0 & 3.3 & +44 & 500 & 0.20 & Fa\'undez & IR-loud\\
 20216+4107 & 20:23:23.60 & +41:17:38.0 & 1.7 & $-$2 & 31 & 0.23 & Beuther & IR-loud, extra \\
 20332+4124 & 20:34:59.90 & +41:34:49.0 & 3.9 & $-$2 & 286 & 0.27 & Beuther & IR-loud\\
 22134+5834 & 22:15:09.30 & +58:49:06.0 & 2.6 & $-$18 & 83 & 0.09 & Beuther & IR-loud\\
 22570+5912\_2 & 22:59:02.80 & +59:27:36.0 & 5.1 & $-$47 & 131 & 0.10 & Beuther & IR-loud, extra\\
 22570+5912\_1 & 22:59:05.90 & +59:28:19.0 & 5.1 & $-$47 & 305 & 0.14 & Beuther & IR-loud, extra\\
 23033+5951 & 23:05:25.50 & +60:08:06.0 & 3.5 & $-$53 & 250 & 0.64 & Beuther & IR-loud\\
 23139+5939 & 23:16:08.70 & +59:55:18.0 & 4.8 & $-$45 & 404 & 0.62 & Beuther & IR-loud, extra\\
 23151+5912 & 23:17:21.00 & +59:28:49.0 & 5.7 & $-$54 & 282 & 0.41 & Beuther & IR-loud, extra\\
 \hline
\end{tabular}
\vspace*{1.5mm}
\end{table}