Then select Marker Options followed by None. First right click one of the new data points and select Format Data Series.

The new data points on the graph should then be formatted to make the markers 'disappear'.

Trendlines can then be added for each of the new series of data to create the min/max lines.

This will result in 4 new points (2 for each new data set) appearing on the graph, on the error bars of the highest and lowest x values.

Repeat the process to add the Max/Min Line 2 data.

Click Add and input the Max/Min Line 1 x and y values, then click OK.

First select the original graph and then click Select Data under the Design tab.

The two new tables of data can then be plotted on the graph as second and third series of data.

To achieve this, some additional data must first be generated:

Max/Min lines are created using trendlines to connect the lower limit of the first data point (i.e y value minus the error) to the upper limit of the last data point and vice versa.

The data (and plot generated from it) for the example used to illustrate this procedure are given below. In some ways a preferred alternative to using regression to find errors in the gradient and intercept is to add max/min lines to a graph, since this determines the error in the gradient and intercept based on the measurement errors made during the data collection rather than just relying on the statistical distribution of the data.Īlthough there is no tool to create max/min lines in Excel, it is still possible to add them by plotting additional data based using the graph error bars/values. PChem Teaching Lab | Excel 10 Using Excel 2010 - Add Max/Min Lines to a Graph

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