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Passing a GNUplot variable to system(/usr/bin/awk)

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Subject	Passing a GNUplot variable to system(/usr/bin/awk)
From	"Dan'l B" <dan.hinckley@gmail.com>
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This line in GNUplot works fine:

system("/usr/bin/awk '/-1.98/{print $2 $1}' /path/to/myfile.txt")

But how would I pass a variable from GNUplot into that in place of the -1.98 value? 

For example, using STATS_max_y from a plot command:

system("/usr/bin/awk '/STATS_max_y/{print $2 $1}' /path/to/myfile.txt")

That (and its variants) don't work, and I can't work out the formatting to do this correctly.

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Passing a GNUplot variable to system(/usr/bin/awk) "Dan'l B" <dan.hinckley@gmail.com> - 2015-06-17 18:00 -0700
  Re: Passing a GNUplot variable to system(/usr/bin/awk) Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2015-06-20 01:43 +0200
    Re: Passing a GNUplot variable to system(/usr/bin/awk) "Dan'l B" <dan.hinckley@gmail.com> - 2015-06-20 07:58 -0700

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