Fig. 4
From: A web-based system for creating, viewing, and editing precursor mass spectrometry ground truth data
The annotation process for isotopic traces and envelopes. a Signals are shown in color based on intensity. b Guard rails are used to help distinguish which signals belong in an isotopic trace. c, d In trace mode, users mark which signals belong to an isotopic trace. e The ruler shows a user specified charge state to measure the isotopic traces within an isotopic envelope. f In envelope mode, users can specify all the traces belonging to an envelope