The nearest found maser object is G4.503+16.342 (offset by 1.9" from input coordinates)
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display_aladin("254.3314170","-16.1568720","G4.503+16.342","G4.503+16.342","(145) IRAS 16544-1604, IRAS 16544-1604, L146, LI 46, NH_3_ peak, 30, L146","0")