# Selecting Mass Position

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Users can either select mass position according to group of channels 1, 2, 3 or 4, 5, 6 or both by checking the checkboxes as displayed.

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<img alt="Select Mass Position" src="images/select_masspos/select_masspos.png" height="30" />
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## Warning when the selected mass position channels not found
If the selected mass position channel cannot be found, a warning will be created in Processing Logs.
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<img alt="Select Mass Position" src="images/select_masspos/warning_req_masspos_not_exist.png" height="60" />
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