How to display constant chart value? [duplicate]

This question already has an answer here: Closed 11 years ago.

Possible Duplicate:

How to add horizontal line to SSRS report?

I am developing a SSRS 2008 report and I'm trying to get a horizontal line to appear on my chart. I am able to get this line to appear by the expression "=0.90". Howe开发者_开发问答ver, if I only have one value along the X-axis, then this line does not appear. How can I get it to appear?

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Use a Splitline