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When I use a data range for error bars, is this the total error or the error up and down?

I have selected a range of values to use for y error bars. I have chosen the "same value for both" option when asked for separate values for the positive and negative error. My question is: say that the value from the range used for one data point is 0.3. When I ask Calc to use "same value for both", is it creating a positive error of 0.3 and a negative error of 0.3, or is it spreading the error across, giving a positive error of 0.15 and a negative error of 0.15 (adding up to a total error of 0.3)?