Here is how you would include error bars in a line plot created in Tecplot. For simplicity, I would assume a single line plot and that the error bars represent the uncertainty in the y-axis variable.

If the error is symmetric, you need to have a single variable that indicates the amount of uncertainty in the y-axis variable.

If the error is asymmetric (e.g., larger error on the positive side), then you need to have separate variables indicating the positive and negative errors. For example, if the y-axis variable corresponds to column 2 (i.e., Tecplot variable V2) has an uncertainty of [-5%, +10%], then you would have one error variable that's defined as 0.05*abs(V2) and another error variable that is defined as 0.10*abs(v2). Note the absolute sign, because you would define the first of these error variables as the "down" error and the second one as the "up" error.

Make a line plot without error bars to begin with.

Go to "mapping style" under the "plot" menu at the top. Select the "Error Bars" submenu at the top of the popup window (which is located just after the "Symbols" menu). For the curve of interest, select (i.e., insert a checkmark) in the "Show Error Bars" column, select the "down error" variable as the "Error Bar Variable," then choose the "Error Bar Type" to be "Down," choose the appropriate option under "Error Bar Spacing" (default is every data point), and finally, select the Error Bar color, size, and line thickness, depending on your preference.

To show the positive (i.e., "Up" error), duplicate the above mapping, change the "Error Bar Type" to "Up", choose the "up error" variable as the "Error Bar Variable," then choose the error bar type as "Up," choose the appropriate option under "Error Bar Spacing" (default is every data point), and finally, select the Error Bar color, size, and line thickness.

If the error is symmetric, i.e., you have a single error variable, then you can have just one mapping and select the "Error Bar Type" to be vertical.

The above process would allow you to plot error bars in a fully customized manner.

Thanks a lot.....really your answer is awesome

what map do you export in Tecplot, you could report the data out and do it in excel or origin.