Fig. 1.
Energy level diagram of H2O indicating the lines observed with Herschel/PACS (blue arrows and labels), with Herschel/SPIRE (green), and with ALMA (red). Labels denote the rounded wavelengths in μm as indicated in the second column of Table 1, except for the line observed with ALMA which is denoted by its frequency in GHz. Upward (downward) arrows indicate lines detected in absorption (emission).
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