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Introduction 

At the top of the results column on the
http://www.slac.stanford.edu/comp/net/iepm-bw.slac.stanford.edu/slac_wan_bw_tests.html
there are links to what were the current reference pages on the web for the various tools.

...

29cal@iepm-bw: fetch-toolspecs \| more#destnodemore
\#destnode, toolname, testtype, datatoanalyze,  daystoanalyze
iepm-bw.bnl.org,mtlaytcp,background-syn,mtlaytcp:mtlaytcp=w p  lt 6 pt 6;mtlaytcp:rttmin=w lt 7 pt 5;
mtlaytcp:rttmax=w lt 2 pt
  5;mtlaytcp:rttavg=w lt 3 pt 5,28

iepm-bw.bnl.org,owping,background,owping:tmin=w p lt  3;owping:tmed=w p lt 6;
owping:tmax=w p lt 37;
owping:fmin=w p lt 1;owping:fmed=w  p lt 7;owping:fmax=w p lt 8,28

iepm-bw.bnl.org,pathchirp,background,pathchirp:pathchirp=w p lt 6  pt 6;
pathchirp:thrumin=w p lt 5 pt 1;
pathchirp:thruavg=w p lt 7 pt 1;  pathchirp:thrumax=w p lt 3 pt  1,28iepm28
iepm-bw.bnl.org,pathload,background-syn,pathload:thrumin=w p lt  6;pathload:
thrumax=w p lt 7,28 
iepm-bw.bnl.org,ping,background,ping:max=w p  lt 7 pt 5;ping:avg=w p lt 2 pt 5;ping:min=w p lt 3 pt  5,28iepm28
iepm-bw.bnl.org,traceroutetlaytcp,background-syn,traceroutetlaytcp:numhopstlaytcp=w p lt 6 pt  6,28
iepm-bw.caltech.ul-org,owping,background,owping:tmin=;
tlaytcp:rttmax=axes x1y2  w p lt 3;owping:tmed=2 pt 5;tlaytcp:rttavg=axes x1y2 w p lt 3 pt  65;owping
tlaytcp:tmaxrttmin=axes x1y2 w p lt 37;7 pt  5,28
iepm-bw.bnl.org,tlaytcptraceroute,background-syn,tlaytcptraceroute:tlaytcpnumhops=w p lt 6 pt 6;tlaytcp:rttmax=axes x1y2   6,28
iepm-bw.caltech.ul-org,owping,background,owping:tmin=w p lt 2 pt 5;
tlaytcp:rttavg=axes x1y2 3;owping:tmed=w p lt 3 pt 5;tlaytcp:rttmin=axes x1y2 6;
owping:tmax=w p lt 7 pt 5,28
37;owping:fmin=w p lt 1;owping:fmed=w  p lt 7;owping:fmax=w p lt 8,28

...

iepm-bw.bnl.org,owping,background,owping:tmin=w p lt 3;owping:tmed=w p lt 6;owping:tmax=w p lt 37;
owping:fmin=w p lt 1;owping:fmed=w p lt 7;owping:fmax=w p lt 8,28

If the toolspec is active (there is a field in the table for deactivating it which is not shown to be in this command),
 
This spec says for the node iepm-bw.bnl.org, plot the following for the individual and history plots for owping for this node:
1. plot the column 'tmin' 'with points linetype 3' which is encoded as 'w p lt 3', which is a valid short form for gnuplot.
2. overplot the column 'tmed' 'with points linetype 6' which is encoded as 'w p lt 6'.
etc.
Thus the data in the columns tmin, tmed, tmax, fmin,fmed,fmax are overploted on the graph.
 
I will now go on to explain the 'datatoanalyze' field in the monitoring hosts table (http://www.slac.stanford.edu/comp/net/iepm-bw.slac.stanford.edu/monitoring-hosts.html^{Image Removed})
Each monitoring host is has a plot specification for the http://www.slac.stanford.edu/comp/net/iepm-bw.slac.stanford.edu/slac_wan_bw_tests.html graphs.It^{Image Removed} is applied across all target hosts which it monitors. If there is no data for a particular type of test, it is ignored.
Let us look at one entry. (the one for iepm-bw.slac.stanford.edu):

...

This says, for all the nodes, overplot the following on the graph for that node
1. 'ping' data 'avg' with 'axes x1y2 with impulses linetype 1'  encoded in the gnuplot short form 'axes x1y2 w i lt 1'
2. 'ping' data min with 'axes x1y2 with impulses linetype 0' encodes in the gnuplot short form 'axes x1y2 w i lt 9'
3. 'pathchirp' data 'pathchirp' 'with points linetype 5 pointtype 1' encoded as 'w p lt 5 pt 1'
etc.
 Bear in mind that is a particular data type does not exist for a target node, it is ignored.
 
There is a table called 'PLOTSPECS' which enables you to specify other types of plots, such as scatterplots, overplot various data.
See :
http://www.slac.stanford.edu/comp/net/iepm-bw.slac.stanford.edu/html/scatterplots/iepm-bw.bnl.org.html^{Image Removed}
 for example.
I am not going to go thru this specification now as it follows the previous rules for specifyin the data. However if you have questions. please feel free to ask.