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Beam line scientists are on-site at SSRL during weekdays only. Each beam line scientist is around for slightly different hours, but in general there will not be someone on site to change mono crystal sets or make changes at the beam line after 7pm(insert agreed upon time here) ____. It's important that you plan any aspects of your run which require a beamline scientist for weekdays, and early enough in the day that this can be done before they go home.