m-graph label

[John Kitzmiller via ntg-context <ntg-context@ntg.nl>]

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The horizontal axis label of mwe below has 0.0 (showing tenths; pdf
attached; filename is mwe.tex).

I expected it to show -1, 0, 1, 2, 3, (integers only). Can this be
formatted?

% -1 1
% 0 1
% 0 2
% 1 1
% 2 1
% 2 2
% 2 3
% 2 4
% 3 1
% 3 2

\usemodule[m-graph]
\startMPpage[instance=graph, offset=5mm]
labeloffset:=3mm;
draw begingraph(8cm,4cm);
  setrange(-1.5,0.5,3.5,5);
  picture symbol ;
  symbol := image(draw fullcircle scaled 5mm withcolor red;);
  gdata("mwe.tex", v,
          clearxy;
            glabel(symbol,v1,v2) ;
           );
    frame.bot shifted(0,-2mm) ;
    autogrid(otick.bot,) shifted(0,-2mm);
endgraph;
\stopMPpage

Thanks! John

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