I don't know how to plot with that test.data.
However, should it maybe help. Page 59 (pdf page 60) of the VAMPIRE 7.0 manual [1] has configuration output keywords, such as config:atoms and config:atoms-output-rate for generating atoms-coords.data and spins-*.data files. Below is an example that uses sp (or splot [2]) using those .data files:
username@computername:~/Desktop/Fe$ ls -l
total 8
-rw-r--r-- 1 username username 674 Mar 14 18:06 Fe.mat
-rw-r--r-- 1 username username 1572 Mar 15 00:18 input
username@computername:~/Desktop/Fe$ ~/vampire/vampire-serial
_
(_)
__ ____ _ _ __ ___ _ __ _ _ __ ___
\ \ / / _` | '_ ` _ \| '_ \| | '__/ _ \
\ V / (_| | | | | | | |_) | | | | __/
\_/ \__,_|_| |_| |_| .__/|_|_| \___|
| |
|_|
Version 7.0.0 Jan 23 2026 11:06:46
Git commit: 525bc27ee44c525aee229570f30f3d4c61d54f66
...
Starting Simulation with Program Curie-Temperature...
Simulation run time [s]: 4061.02
Monte Carlo statistics:
Total moves:
5817280000 50.5782% Accepted
49.4218% Rejected
Simulation ended gracefully.
username@computername:~/Desktop/Fe$ ls -l *.data
-rw-rw-r-- 1 username username 133089 Mar 15 00:19 atoms-coords.data
-rw-rw-r-- 1 username username 32933 Mar 15 00:19 spins-00000000.data
-rw-rw-r-- 1 username username 158450 Mar 15 00:26 spins-00000001.data
-rw-rw-r-- 1 username username 155142 Mar 15 00:32 spins-00000002.data
-rw-rw-r-- 1 username username 155263 Mar 15 00:39 spins-00000003.data
-rw-rw-r-- 1 username username 159846 Mar 15 00:45 spins-00000004.data
-rw-rw-r-- 1 username username 153171 Mar 15 00:52 spins-00000005.data
-rw-rw-r-- 1 username username 158121 Mar 15 00:58 spins-00000006.data
-rw-rw-r-- 1 username username 157155 Mar 15 01:04 spins-00000007.data
-rw-rw-r-- 1 username username 158213 Mar 15 01:11 spins-00000008.data
-rw-rw-r-- 1 username username 156371 Mar 15 01:17 spins-00000009.data
-rw-rw-r-- 1 username username 156652 Mar 15 01:23 spins-00000010.data
username@computername:~/Desktop/Fe$ gnuplot
gnuplot> set cbrange [-1:1]
gnuplot> sp "<paste atoms-coords.data spins-00000000.data" u 3:4:5:8 palette
gnuplot> set terminal wxt 1
gnuplot> sp "<paste atoms-coords.data spins-00000010.data" u 3:4:5:8 palette