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The TOF calibration curve is linear out to 4000 m/z so the default calibration using m/z 2721.8948 should provide satisfactory results. I've never tried to calibrate an Agilent TOF with CsI but I suspect that the clusters might not stay intact through the ion optics pathway. You might try to lower the fragmentor voltage to start; the default settings may be de-clustering the CsI clusters.
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