2. After entering execel, you can enter the data of standard curve.

3. Click Select Insert in the upper right corner of the software, and select the scatter plot in the figure, as shown in the figure;

4. A chart box will appear next. Right-click the menu in the grouping table box, and then click Select to select the data option.

5. A dialog box will appear again. Select two rows in the diagram with the mouse, and then click OK.

6. Now, you need to move to a place on the map and select it with the right mouse button. Then enter the menu and add a trend line.

7. After a series of steps, you need to set the format of the trend line. This can be set according to your own needs, as shown in the figure, you can draw a curve.