graph - Mean Line in GNUPlot -

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i'm trying average response time in graph of apache requests , response times.

sample data:

11/may/2011:17:34:55 2 11/may/2011:17:34:56 38 11/may/2011:17:34:56 2 11/may/2011:17:34:56 493 11/may/2011:17:34:56 2 11/may/2011:17:34:57 281

the data graphed using this:

plot "input.dat" using 1:2

what want line in center of average response time every x value.

sample graph:

http://i.min.us/jlcmby.png

this blog post shows how analyze access log moving mean in gnuplot , preprocess data awk totals every second.


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