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### ERRPLOT Procedure

ERRPLOT Procedure

Note: The new ERRORPLOT function has replaced much of the functionality of the ERRPLOT procedure.

The ERRPLOT procedure plots error bars over a previously drawn plot.

This routine is written in the IDL language. Its source code can be found in the file errplot.pro in the lib subdirectory of the IDL distribution.

## Examples

To plot symmetrical error bars where Y is a vector of data values and ERR is a symmetrical error estimate, enter:

`; Plot data:`
`PLOT, Y`
` `
`; Overplot error bars:`
`ERRPLOT, Y-ERR, Y+ERR`
` `

If error estimates are non-symmetrical, provide actual error estimates in the upper and lower arguments.

`; Plot data:`
`PLOT,Y `
` `
`; Provide custom lower and upper bounds:`
`ERRPLOT, lower, upper`

To plot Y versus a vector of abscissas:

`; Plot data (X versus Y):`
`PLOT, X, Y`
` `
`; Overplot error estimates:`
`ERRPLOT, X, Y-ERR, Y+ERR`

## Syntax

ERRPLOT, [ X, ] Low, High [, WIDTH=value]

Graphics Keywords:[, CLIP=[X0, Y0, X1, Y1]] [, COLOR=value] [, /DATA| , /DEVICE| , /NORMAL] [, LINESTYLE={0 | 1 | 2 | 3 | 4 | 5}] [, /NOCLIP] [, PSYM=integer{0 to 10}] [, SYMSIZE=value] [, /T3D] [, THICK=value] [, Z=value]

## Arguments

### X

A vector containing the abscissa values at which the error bars are to be plotted. X only needs to be provided if the abscissa values are not the same as the index numbers of the plotted points.

### Low

A vector of lower estimates, equal to data - error.

### High

A vector of upper estimates, equal to data + error.

## Keywords

### WIDTH

The width of the error bars. The default is 1% of plot width.

## Version History

 Original Introduced