Table 2: Identification of the lines detected in the K-band spectra of candidate massive YSOs. Column 1 lists the rest wavelength, Col. 2 the corresponding element and Col. 3 the line transition.
$\lambda$ ($\mu $m) Element Transition

2.0893		 Fe  II 3d6.4p-3d6.4s
2.1127 He I 1s.3p-1s.4s
2.1138 He I 1s.3p-1s.4s
2.1218 H2 1-0 S(1)
2.1374 Mg II 5s-5p
2.1438 Mg II 5s-5p
2.1624 He I 1s.4d-1s.7s
2.1649 He I 1s.4f-1s.7g
2.1661 H I(Br$\gamma $) 7-4
2.2935 CO 2-0
2.3227 CO 3-1
2.3535 CO 4-2
2.3829 CO 5-3
2.3329 H I 33-5
2.3364 H I 32-5
2.3402 H I 31-5
2.3445 H I 30-5
2.3492 H I 29-5
2.3544 H I 28-5
2.3603 H I 27-5
2.3669 H I 26-5
2.3743 H I 25-5
2.3828 H I 24-5
2.3924 H I 23-5

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