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+import feynman;
+
+
+// set default line width to 0.8bp
+currentpen = linewidth(0.8);
+
+// scale all other defaults of the feynman module appropriately
+fmdefaults();
+
+// define vertex and external points
+
+real L = 50;
+
+pair zl = (-0.75*L,0);
+pair zr = (+0.75*L,0);
+
+pair xu = zl + L*dir(+120);
+pair xl = zl + L*dir(-120);
+
+pair yu = zr + L*dir(+60);
+pair yl = zr + L*dir(-60);
+
+
+// draw propagators and vertices
+
+drawFermion(xu--zl);
+drawFermion(zl--xl);
+
+drawPhoton(zl--zr);
+
+drawFermion(yu--zr);
+drawFermion(zr--yl);
+
+drawVertex(zl);
+drawVertex(zr);
+
+
+// draw momentum arrows and momentum labels
+
+drawMomArrow(xl--zl, Relative(left));
+label(Label("$k'$",2RightSide), xl--zl);
+
+label(Label("$k$",2LeftSide), xu--zl);
+
+drawMomArrow(zl--zr, Relative(left));
+label(Label("$q$",2RightSide), zl--zr);
+
+drawMomArrow(zr--yu, Relative(right));
+label(Label("$p'$",2LeftSide), zr--yu);
+
+label(Label("$p$",2RightSide), zr--yl);
+
+
+// draw particle labels
+
+label("$e^-$", xu, left);
+label("$e^+$", xl, left);
+
+label("$\mu^+$", yu, right);
+label("$\mu^-$", yl, right);