OD Level is in meters relative to the Malin Head OSGM15 datum.
You can view an image or download data using the Download button on the menu.
Only data for the past 1 day is shown.
Times are always shown in UTC (GMT).
To use the graph:
Zoom in: click and drag a horizontal or vertical box.
Zoom full: double click.
Smooth data: change roll period (text box bottom left of chart), from 1 to e.g. 24.
Graph by: Dygraphs
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