Figure 71a

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Figure Caption

Left: $\Delta\alpha$ versus impact angle for a typical TRD chamber in Run~2, having a fixed uncalibrated drift velocity. The quoted values refer to the Run~2 calibration procedure (upper row) and to the new calibration scheme (lower row). Right: Average $\Delta\alpha$ versus impact angle for all TRD chambers after the calibration was applied. The red band shows the RMS of the distribution.

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Figure extracted from paper