Line profiles measured on ¹³CO 1–0 (black, BU-FCRAO Galactic Ring Survey) and in [C i] (red, KOSMA) towards the IRDC G48.65-0.29. All positions are given relative to the zero position of 19^h21^m44.7^s, 13°49′31.7′′ (J2000). For each point we show the spectrum covering the velocity range from 20 to 70 km s^-1 and an antenna temperature range from –0.2 to 3.4 K. The positions without [C i] spectra were either not covered in the mapping or covered by a bad pixel providing a noise level much higher than the line intensity. The dotted lines at 34 km s^-1 mark the LSR velocity of the IRDC.