Hi,
This must be due to "speed mode" setting of your graph. If speed mode is turned on, then all data is not plotted, to speed up plotting. And by default when the graph is copy-pasted, all data is shown in the EMF object that is copied.
When speed mode is on (and not all data is plotted in graph), there is by default a watermark shown on the graph that says "Speed Mode is On". Also the layer icon will be red. Perhaps in your case this watermark was turned off. The watermark can be turned on using the Tools|Options|Graph dialog which has a check box at the bottom.
Now, if you double click on the graph, or right click and select Plot Details, you can click on the Layer level of the tree on the left and then "Size/Speed" tab on the right and you will see check box for turning speed mode on/off for the graph and when on you can specify how many points.
So you could simply turn off speedmode and save this graph and save the graph as template as well if you want to re-use this kind of graph with other data.
Note that whether speed mode setting should affect the export, is determined by a check box which is at the Graph node level in Plot Details. Click on Graph in the left panel and then the Miscellaneous tab and there will be a check box to control this.
Easwar OriginLab
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