Comparison between the observations and the predictions from the radiative transfer model for the [C i] /[C i]  line ratio (black-solid lines) and the [C i] absolute intensity (gray-dashed lines) for kinetic temperatures of 80, 120, and 160 K. The observed [C i] /[C i]  line ratio of 0.92 is shown as a red line with circles. The observed [C i]  line intensity of 0.58 K and its value scaled by a beam filling factor of 1/8 and 1/16 are shown as blue lines with boxes.