What is the red box around the blue calculated timeline bar?

Some of the passes have a red box around the blue calculated timeline bar… Why? What does it mean?

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This red border means that the pass is partial (truncated) due to other scheduled observations on the station.

You will see it when you schedule from station page an observation that is overlapped and when you schedule from the observation/new page and in advanced options you choose “Show truncated”.

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Ah. Thanks so much for the clear explanation.