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If the data is set to Load Mode > Manual, simply click Load Data. If you want all the tracks to load data at once, use the Load Data button (red box, arrow); to load a single track use the Load Data icon in the Data Management Table (red arrow). Sequence can be loaded from the Load Sequence button (purple box, arrow).
You might load a track and then zoom out to show a greater region of the data sets. IGB will show gray where the track is not loaded yet (red arrows).
