Table A.2: Main characteristics of the 32 YSO candidates detected at 7 and 15 $\mu $m: J and K DENIS magnitudes, ISO-DENIS association quality flag $q_{\rm ID}$and separation; magnitudes, uncertainties and quality flags at 7 and 15 $\mu $m, 7-15 $\mu $m association quality flag $q_{\rm II}$ and separation; aperture magnitude at 15 $\mu $m; MSX: this column contains a "+'' if the source is associated (within 8'') with an MSX source with FE/FD>2, and a "X'' if there is an association, but with FE/FD<2.
ISOGAL name J K $q_{\rm ID}$ sep. [7] $\sigma_7$ q7 [15] $\sigma _{15}$ q15 $q_{\rm II}$ sep. ap15 MSX
ISOGAL-PJ mag mag $\leq$5 '' mag mag $\leq$4 mag mag $\leq$4 $\leq$4 '' mag  
174433.8-291355 - - - - 6.49 0.10 4 1.98 0.12 4 4 1.30 1.10 +
174437.9-291014 - - - - 6.98 0.16 3 4.20 0.18 3 2 4.68 1.45 +
174449.5-291805 15.31 9.02 4 1.49 6.20 0.12 4 2.45 0.14 3 0 6.59 1.70 +
174452.5-291122 11.39 7.66 2 3.05 5.70 0.18 3 2.11 0.13 4 2 3.95 0.60 +
174454.9-291413 - - - - 4.27 0.09 4 1.01 0.04 4 4 0.91 0.55 +
174455.3-291538 - - - - 4.97 0.12 4 1.82 0.06 4 4 0.46 1.40 +
174455.8-292009 - 10.51 4 1.76 7.23 0.13 4 3.98 0.09 4 3 2.12 2.80  
174455.8-291727 11.92 10.62 2 3.46 6.98 0.09 4 2.39 0.05 4 4 0.42 1.90 X
174456.1-291257 - - - - 5.93 0.05 4 1.36 0.10 4 4 0.41 0.60 X
174457.0-290557 15.25 10.11 5 0.63 4.48 0.17 3 1.65 0.08 4 4 0.94 0.70 +
174459.1-290653 - 11.07 4 1.47 6.89 0.10 4 3.49 0.05 4 4 0.76 3.00 +
174459.5-291604 - 10.78 3 1.81 4.08 0.17 3 0.50 0.12 3 4 1.33 -0.30 +
174503.2-291737 - - - - 5.90 0.06 4 2.40 0.07 4 4 0.47 1.90 +
174503.4-290900 - - - - 5.68 0.18 3 1.76 0.17 3 4 1.82 0.00 +
174503.5-291552 - 11.06 2 2.96 4.13 0.10 4 0.62 0.04 4 4 1.67 0.35 +
174504.4-291359 - - - - 6.96 0.17 3 3.62 0.14 3 3 2.95 2.00 +
174504.9-291146 15.24 9.01 5 1.11 4.27 0.09 4 1.97 0.11 4 4 1.66 0.70 +
174505.6-291018 - - - - 5.24 0.16 3 1.78 0.09 4 4 1.09 1.00 +
174506.4-291648 13.51 9.17 5 0.34 7.41 0.12 4 3.96 0.13 3 2 3.54 1.50 +
174506.5-291118 - - - - 5.29 0.12 4 0.88 0.07 4 4 0.33 0.10 +
174508.0-291039 14.44 9.03 5 0.67 6.59 0.09 4 4.24 0.11 4 2 4.38 2.80  
174508.4-291753 - - - - 7.94 0.10 4 3.66 0.09 4 4 1.78 2.60 +
174516.2-290315 11.47 7.86 5 1.05 5.66 0.15 3 1.03 0.19 3 2 3.42 -1.00 +
174517.8-290813 - - - - 7.30 0.09 4 4.10 0.09 4 4 0.42 3.50 +
174518.1-290439 - - - - 6.30 0.10 4 2.54 0.05 4 4 1.66 1.95 +
174518.1-291051 - - - - 6.51 0.16 3 3.00 0.08 4 4 0.68 2.60  
174520.7-291258 - - - - 5.97 0.19 3 2.79 0.11 4 4 1.55 1.70 +
174520.7-290213 - 10.40 2 2.89 4.57 0.18 2 0.40 0.12 3 4 0.61 -0.40 +
174522.8-290331 - - - - 5.16 0.14 3 2.29 0.14 3 2 5.51 1.30 $^{(\dagger)}$  
174523.3-290331 15.76 8.48 5 0.24 5.52 0.09 1 2.29 0.14 3 3 2.67 1.30 $^{(\dagger)}$  
174523.9-290310 14.58 8.72 5 0.36 6.09 0.06 4 3.29 0.14 3 2 3.95 2.30  
174526.3-291229 - - - - 6.67 0.16 2 2.31 0.09 4 4 0.46 1.60 +

Note: $^{(\dagger)}$ These two 7 $\mu $m sources correspond to a single source at 15 $\mu $m.

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