If you see a loss of peak symmetry and sensitivity, first try changing the inlet consumables. If that does not help, try trimming the restrictor column. Trim as much as your maintenance protocols call for, but typically 10-30 cm is sufficient. Note that the length of the restrictor determines the flow and retention times. If the restrictor tubing becomes too short, you can either (a) adjust the restrictor length in your setup and set the same flow, or (b) reduce the flow manually to match the original retention.
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