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When the "same value for both" option is selected, the data range selected is used for values for the positive error and for the negative error, and not considered as "total error"; in other words, the data are used as the error up AND down, and not as total error.

It is easier to explain by example: if the data used for the error of one data point is 10 and the "same value for both" error bars option is selected, then a positive error of 10 will be created as well as a negative error of 10, resulting in a total error (or "uncertainty") of 20.