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Buffer-gas pressure in sealed alkali vapor cells can be inferred from the collisional shift and broadening of an optical line, but routine use requires reproducible calibration and fitting. We describe a Python workflow that anchors the frequency axis on the hyperfine comb of an unperturbed reference cell, divides the target by that reference to cancel the power ramp and etalon fringes, and fits a fixed-structure hyperfine Voigt comb.
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