These examples show how to set up errorbars, either from data or from a simple constant error in measurement.
There are three charts, the second has errors shown in both the x and y dimensions. The third just uses arrowheads to emphasise the range.
Temperature
10
15
20
25
30
35
40
Yield (gm)
0
5
10
15
20
25
30
35
40
Scatterplot with Errorbars
Temperature
10
15
20
25
30
35
40
Yield (gm)
0
5
10
15
20
25
30
35
40
Scatterplot with Errorbars
Temperature
10
15
20
25
30
35
40
Yield (gm)
0
5
10
15
20
25
30
35
40
Range shown with arrowheads
This just shows the range