Horizontal lines run left to right, parallel to the horizon, with slope 0 and equation y = k. Vertical lines run top to bottom, perpendicular to the horizon, with undefined slope and equation x = k.
\newcommand{\scalartwoloopselfenergy}[1][1] { \begin{tikzpicture}[scale=#1,transform shape, baseline=(b.base)] \begin{feynman}[inline=(b.base)] \vertex (i1); \vertex ...
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