1. Example of multiple Statistica graphs available in Statistica workbook (.stw) or in Statistica graph files (.stg).

2. Open the graph in Statistica, put mouse on the graph, right click the mouse, select "Merge graph" from the drop down manual

3. In the "Merge graph" dialog, the open Statistica graph files (.stg) and open Statistica workbooks will be listed. Expand the list and choose the graph that you want to merge to the current graph. 

Or click on the "Files" button to browse to local directories and select Statistica workbook (.stw) or graph (.stg) documents.

Click OK after chosen the graph to merge.

4. The two graphs were merged into a single one. The legend was automatically updated to include the two regression lines.

5. The two regression lines in the merged graph are in the same color and pattern. To change the patterns to differentiate the two, click on one regression line, right click the mouse, select "Pattern" option from the drop down manual. 

6. In the line property dialog, user can change the width, pattern, color and style of the lines. 

Click OK.

The two regression lines could be differentiated easily in the merged graph. The legend is updated too.