diff --git a/doc/cdeftutorial.1 b/doc/cdeftutorial.1
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--- a/doc/cdeftutorial.1
+++ b/doc/cdeftutorial.1
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.IX Title "CDEFTUTORIAL 1"
-.TH CDEFTUTORIAL 1 "2008-10-30" "1.3.5" "rrdtool"
+.TH CDEFTUTORIAL 1 "2009-02-21" "1.3.99909060808" "rrdtool"
.SH "NAME"
cdeftutorial \- Alex van den Bogaerdt's CDEF tutorial
.SH "DESCRIPTION"
to add it. I will then try to provide an answer in the next release
of this tutorial. No feedback equals no changes! Additions to
this document are also welcome. \*(-- Alex van den Bogaerdt
-<alex@ergens.op.het.net>
+<alex@vandenbogaerdt.nl>
.Sh "Why this tutorial?"
.IX Subsection "Why this tutorial?"
One of the powerful parts of RRDtool is its ability to do all sorts
.PP
.Vb 7
\& counter value resulting rate
-\& 10\(aq000
-\& 10\(aq060 1; (10\(aq060\-10\(aq000)/60 == 1
-\& 10\(aq120 1; (10\(aq120\-10\(aq060)/60 == 1
-\& unknown unknown; you don\(aqt know the last value
-\& 10\(aq240 unknown; you don\(aqt know the previous value
-\& 10\(aq300 1; (10\(aq300\-10\(aq240)/60 == 1
+\& 10'000
+\& 10'060 1; (10'060\-10'000)/60 == 1
+\& 10'120 1; (10'120\-10'060)/60 == 1
+\& unknown unknown; you don't know the last value
+\& 10'240 unknown; you don't know the previous value
+\& 10'300 1; (10'300\-10'240)/60 == 1
.Ve
.PP
If the \s-1CDP\s0 was to be calculated from the last five updates, it would get
\& CDEF:prev3=PREV(prev2)
\& CDEF:median=prev1,prev2,prev3,+,+,3,/
\& LINE3:median#000077:filtered
-\& LINE1:prev2#007700:\(aqraw data\(aq
+\& LINE1:prev2#007700:'raw data'
.Ve
.PP
.Vb 1
\& CDEF:prevtime=PREV(time)
\& CDEF:derivate=var,prev1,\-,time,prevtime,\-,/
\& LINE3:derivate#000077:derivate
-\& LINE1:var#007700:\(aqraw data\(aq
+\& LINE1:var#007700:'raw data'
.Ve
.SH "Out of ideas for now"
.IX Header "Out of ideas for now"
other people on the RRDtool mailing list. Please let me know if you
find errors in it or if you have trouble understanding it. If you
think there should be an addition, mail me:
-<alex@ergens.op.het.net>
+<alex@vandenbogaerdt.nl>
.PP
Remember: \fBNo feedback equals no changes!\fR
.SH "SEE ALSO"
.SH "AUTHOR"
.IX Header "AUTHOR"
Alex van den Bogaerdt
-<alex@ergens.op.het.net>
+<alex@vandenbogaerdt.nl>