Fig. 6.
Construction of a stable lines catalogue. Top: overall cavity width fit (black line) from the HC lines (dots) for fifty exposures. Bottom: zoom showing how the values for each line cluster together, but can be offset from the main fit. For scale, a cavity width offset of 0.2 μm corresponds to a velocity offset of 4.88 km s−1, using the FP equation and the initial cavity width value of 2d = 24.4999 mm.
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