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% vim: set ts=2 sw=2 noet:
\begin{tikzpicture}[
axis/.style = {
thick, -latex, black,
},
star/.style = {
draw = black, thick, fill = red!50,
circle, outer sep = 1mm, inner sep = 0,
minimum size = 1.5mm,
},
]
\draw[lightgray, densely dotted, step = 10mm] (-19mm,-19mm) grid (19mm,19mm);
\draw[axis] (-25mm,0) to (25mm,0) node[right] {\(\phi_i\)};
\draw[axis] (0,-25mm) to (0,25mm) node[above] {\(\phi_q\)};
\foreach \i in {0,1,...,3}{
\foreach \q in {0,1,...,3}{
\node[star] (s\i\q) at ({\i*10mm - 15mm},{\q*10mm - 15mm}) {};
}
}
% special node for the example
\node[star, fill = blue!40!white] at (s32) {};
\foreach \i/\l in {0/00,1/01,2/11,3/10}{
\node[lightgray, below = 3mm] at (s\i0) {\texttt{\l}};
\node[lightgray, left = 2mm] at (s0\i) {\texttt{\l}};
}
\end{tikzpicture}
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