Merge remote-tracking branch 'upstream/master'

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diff --git a/buch/papers/erdbeben/images/messrauschen_geaendert.tex b/buch/papers/erdbeben/images/messrauschen_geaendert.tex
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+%
+% messrauschen_geaendert.tex -- Kombination der Messrauschen-Bilder
+%
+% (c) 2021 Prof Dr Andreas Müller, OST Ostschweizer Fachhochschule
+%
+\documentclass[tikz]{standalone}
+\usepackage{amsmath}
+\usepackage{times}
+\usepackage{txfonts}
+\usepackage{pgfplots}
+\usepackage{csvsimple}
+\usetikzlibrary{arrows,intersections,math}
+\begin{document}
+\newboolean{showgrid}
+\setboolean{showgrid}{false}
+\def\skala{1}
+\begin{tikzpicture}[>=latex,thick,scale=\skala]
+
+\node at (0,0) {\includegraphics[width=14cm]{../Messrauschen_geaendert.PNG}};
+
+\def\yten{-2.06}
+\def\yfifteen{0.16}
+
+\def\links{12.2}
+\def\rechts{14.2}
+
+\pgfmathparse{(\yfifteen-(\yten))/5}
+\xdef\m{\pgfmathresult}
+\xdef\b{\yten}
+
+\pgfmathparse{\m*(\links-10)+(\b)}
+\xdef\Links{\pgfmathresult}
+
+\pgfmathparse{\m*(\rechts-10)+(\b)}
+\xdef\Rechts{\pgfmathresult}
+
+\begin{scope}[yshift=-9cm]
+\node at (0,0) {\includegraphics[width=14cm]{../Messrauschen_geaendert_zoom.PNG}};
+\end{scope}
+
+\def\breite{7}
+\def\hoehe{2}
+
+% Gitter
+\ifthenelse{\boolean{showgrid}}{
+\draw[step=0.1,line width=0.1pt] (-\breite,-\hoehe) grid (\breite, \hoehe);
+\draw[step=0.5,line width=0.4pt] (-\breite,-\hoehe) grid (\breite, \hoehe);
+\draw                            (-\breite,-\hoehe) grid (\breite, \hoehe);
+\fill (0,0) circle[radius=0.05];
+}{}
+
+\def\unten{-4.15}
+
+\draw[line width=0.7pt] (\Links,\unten) rectangle (\Rechts,4.15);
+\draw[line width=0.7pt] (\Links,\unten) -- (\Links,{\unten-0.05})
+	-- (-6.45,-4.6) -- (-6.45,-4.9);
+\draw[line width=0.7pt] (\Rechts,\unten) -- (\Rechts,{\unten-0.05})
+	-- (6.86,-4.6) -- (6.86,-4.9);
+\end{tikzpicture}
+\end{document}
+