Left panel: recording of the JKa, Kc = 230,23 – 220,22 transition of HCCO. Total integration time is 309 s with a time constant of 3 ms. Right panel: recording of the JKa, Kc = 120,12 – 110,11 transition of DCCO. Total integration time is 127 s with a 3 ms time constant. The red curves represent our modeled 2f Voigt profiles (see text).
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