gkrellm plugin question

I'm trying out a plugin for gkrellm that reads from a text file and is
supposed to display it. It's called FMonitor, which has the data from
say GrabWeather. I'm configuring FMonitor to point to a certain file
but in the configuration panel it asks for a label. I enter "TEMP" and
the file it's pointing to has but one line "Temp: 87 C" (example only).
But gkrellm only shows the label. How do I make it show the file
contents instead of the label?

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