I see that Bigcharts has outsmarted me. I posted links that are changed by Bigcharts. If you construct a comparison and then save the link - Bigcharts erases the comparison.

You can do it yourself: go to the KXL Bigcharts chart I gave you, then click on "Compare to", then put in CA:SGX for Sage, or CA:G for Goldcorp. Then change "time" to e.g. 6 months, and "frequency" to daily, and then redraw chart.