You can kludge together something that vaguely resembles std dev or std err bars. Add two columns to your dataTable, one representing the lower bound and one for the upper bound. Build the chart as a combo chart, with type "line" for your data and type: "bars" for the bounds, set the isStacked option to true, and set the color of the lower bound column to match the background of your chart. It is far from perfect, and I'm not certain it would even qualify as "good enough", but it sort-of works.
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