Fig. 6.

Four traces of continuous measurements of spin at a fixed value of magnetic field corresponding to the peak of the intrinsic spin signal (Inset; 3,346 G). The traces are obtained in sequence on the same batch of W1118 WT flies kept at 6 °C and bathed in nitrogen gas. The order of exposure was Xe, SF₆, N₂O, and CHCl₃. The colored traces represent baseline-corrected raw data from the spectrometer. The red traces are the same after smoothing with a 50-point box filter. No signal is present in nitrous oxide, and a small signal is present in xenon. The sulfur hexafluoride and chloroform signals have a similar amplitude, but the chloroform signal seems irreversible on this time scale.