4CI setupCI setup, 37To vent the CI MSD, 38To remove the CI MSD covers, 39To pump down the MSD, 40To install the GC column in the EI/CI GC/MSD interface, 42To switch from CI to EI operating mode, 44To switch from EI to CI operating mode, 45To install the CI ion source, 46To install the CI interface tip seal, 48