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The N = 171,16 - 161,15 transition at ~683.8 GHz. In black, the signal obtained by HSO produced by discharging (current = 55 mA) 43 mTorr of H2O only and employing a modulation depth of 1.6 MHz. In red we show the signal when a magnetic field of 126 G has been applied to the previous conditions.
