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stop “histeps” from terminating to zero (y=0) at start and endpoints?

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Subject	stop “histeps” from terminating to zero (y=0) at start and endpoints?
From	Anirban Dutta <anirbanonline92@gmail.com>
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I am using the following script for plotting data points from file "delete.dat"

-------------------------
set terminal jpeg
set output "delete_histeps.jpeg"

set title "with histeps"
plot "delete.dat" using 1:2 index 0 pt 7 ps 0.2 lc "black" notitle,\
"delete.dat" using 1:2 index 1 pt 7 ps 0.2 lc "red" notitle,\
"delete.dat" using 1:2 index 2 pt 7 ps 0.2 lc "green" notitle,\
"delete.dat" using 1:2 index 0 with histeps lc "black",\
"delete.dat" using 1:2 index 1 with histeps lc "red",\
"delete.dat" using 1:2 index 2 with histeps lc "green"
--------------------------


and the "delete.dat" file is


---------------------
1 2
3 4
5 6
7 8
9 10


-1 5
-2 3
-3 4
-4 2
-5 6


5 1
6 2
7 3
8 4
9 5
10 4
11 3
12 12
---------------------


But the start and end step is dropping to zero, which I don't want. Though for step and fsteps command, the steps begin (end) at the first (last) data point, without dropping down to zero (y=0). Can you please suggest that works like histeps (which keeps data points in the middle of the steps) but does not terminate to zero (like steps or fsteps).

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stop “histeps” from terminating to zero (y=0) at start and endpoints? Anirban Dutta <anirbanonline92@gmail.com> - 2019-11-04 08:56 -0800

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