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import graph;
path p=(10,75)..(15,85)..(20,90)..(35,85)..(40,79)--(78,30)..(85,15)..(87,5);
pair l=point(p,3.5);
pair m=point(p,4.5);
pair s=point(p,4.9);
pen c=linewidth(1.5);
pair o=(m.x,0.5(m.x+l.y));
pen d=c+darkgreen;
void drawarrow(string s="", pair p, pair q, side side=RightSide,
bool upscale=false, pen c)
{
path g=p{dir(-5)}..{dir(-85)}q;
if(upscale) g=reverse(g);
draw(s,g,side,c,Arrow(Fill,0.65));
}
void spectrum(pair l,pair m, pair s) {
draw(p,c);
d += 4.0;
dot("$p$",l,SW,d);
dot("$q$",m,SW,d);
dot("$k$",s,SW,d);
xaxis("$k$",0);
yaxis("$E(k)$",0);
}
drawarrow("$T_p$",l,m,true,blue);
drawarrow("$T_k$",m,s,LeftSide,red);
spectrum(l,m,s);
shipout("triadpqk");
erase();
drawarrow("$-T_p$",l,m,LeftSide,red);
drawarrow("$-T_q$",m,s,true,blue);
spectrum(l,s,m);
shipout("triadpkq");
erase();
drawarrow("$T_k$",l,m,true,blue);
drawarrow("$T_q$",m,s,LeftSide,red);
spectrum(m,s,l);
shipout("triadkpq");
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