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- the upper line indicates the origin of the data
- original data: no line is displayed
- automatically corrected data (original data flagged as unreliable and automatically interpolated): blue line
- automatically completed data (original data is missing and interpolated by system): magenta line
- manual corrected data (original data edited by a user): dark blue line
- manual completed data (filled up by a user): dark magenta line
- the middle line indicates the quality of the data
- reliable data: no line is displayed
- doubtful data: light yellow
- unreliable data: dark yellow
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