On-the-fly maps of H₂O in C/2009 P1 (Garradd) obtained with the WBS. Left: the 1₁₀–1₀₁ 557 GHz line observed on 6.291 October 2011 UT. Right: the 2₀₂–1₁₁ line at 988 GHz observed on 6.597 October 2011 UT. The contour spacing is 1 K km s^-1 in brightness temperature, corresponding to  ~ 6σ. The Sun direction is indicated at lower right. The beam sizes are 381 and 215 at 557 GHz and 988 GHz, respectively.