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How does splot recognize read-in measured values as area in the room?

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I read in a file with 5 data triplets.
The 5th data triple corresponds to the 1st, so that a closed polyline is created.
Unfortunately I can't mark this area, probably gnuplot doesn't recognize the polyline as an area.

This is the command sequence:
reset
set title "Auffederung und Spiel" 
set xlabel "Tischlaenge [mm]" 
set xlabel  offset character -1, -1, 0 font "" textcolor lt -1 norotate

set ylabel "Tischtiefe [mm]" 
set ylabel  offset character 1, -2, 0 font "" textcolor lt -1 rotate

set zlabel "Verlagerung [mm]" 
set zlabel  offset character -1, 0, 0 font "" textcolor lt -1 rotate

# set isosamples 50
splot 'Auffederung_Surface_1Step.dat' with lines notitle
# set surface iso1


The data file looks like this:
# Auffederung_Surface.dat
# Testdatei für Gnuplot
#
# Daten für Auffederung in 3D			
# 	Fläche Kraft		0
# x	y	z	
0	0	1.87	
2300	0	1.90	
2300	1000	1.73	
0	1000	1.67	
0	0	1.87
			
# 	Fläche Kraft		4000
# x	y	z	
#0	0	2.73	
#2300	0	2.75	
#2300	1000	2.59	
#0	1000	2.55	
#0	0	2.73
			
# 	Fläche Kraft		8000
# x	y	z	
#0	0	3.58	
#2300	0	3.60	
#2300	1000	3.45	
#0	1000	3.42	
#0	0	3.58


I tried many different parameters but the result was always negative.

I'd appreciate a tip.

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How does splot recognize read-in measured values as area in the room? rr.aus.h.und.ursa.minor@gmail.com - 2017-10-26 10:37 -0700
  Re: How does splot recognize read-in measured values as area in the room? Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2017-10-27 03:08 +0200

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