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VisIt supports visualization of 1D data, however in limited form. For making 1D plots it is suggested to use python w-data library.

Suppose you have data generated by 1d code for lattice:

# W-DATA 0.2.0
# More information about the WData format see: https://gitlab.fizyka.pw.edu.pl/wtools/wdata/-/wikis/home
nx                      128   # lattice
ny                       16   # lattice
nz                       16   # lattice
dx                        1   # spacing
dy                        1   # spacing
dz                        1   # spacing
datadim                   1   # dimension of block size: 1=nx, 2=nx*ny, 3=nx*ny*nz

To open it with VisIt, you need to chose Curve->opretaors->Lineout plot

and next set Lineout attributes, in this case as

To reajust y axis to range of data, you will need Reset plot after drawing it: