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Definition can be found in the ODF v1.2 specification, Part 1, under 20.13 chart:error-category:

The chart:error-category attribute is used to determine which function is used to calculate error indicators at data points. By default, no error indicators are shown. The defined values for the chart:error-category attribute are:

• cell-range: Use values from cell ranges for positive and negative error indicators. The chart:error-lower-range and chart:error-upper-range attributes determine the cell ranges which contain the values to be used for negative and positive error indicators.

• constant: Use fixed absolute values for both directions: positive and negative The absolute value for a positive direction is given with chart:error-upper-limit attribute. The absolute value for a negative direction is given with chart:error-lower-limit attribute.

• error-margin: Use a fixed percentage of the largest value – this is called error-margin. The percentage value is given within chart:error-margin attribute.

• none: No error indicators are shown.

• percentage: Use a fixed percentage of each value The percentage value is given within chart:error-percentage attribute.

• standard-deviation: Standard deviation of the values of a series assuming an equal distribution.

• standard-error: Standard error (standard deviation of the mean) of the values of a series.

• variance: Variance of the values of a series assuming an equal distribution.

This attribute is evaluated for chart styles that are applied to <chart:error-indicator>, <chart:series> or <chart:plot-area> elements.