\documentclass[tikz,border=1.5pt]{standalone}
\input{style}
\begin{document}

\begin{tikzpicture}[x=1mm,y=1mm]
\path[use as bounding box] (0,-3) rectangle (164,57);
\node[anchor=west,font=\bfseries\small] at (0,54) {(a) Scope and projection};
\node[anchor=west,font=\bfseries\small] at (99,54) {(b) Spatial eligibility};
\node (q) at (4,34) {$I,q$};
\node[draw,rectangle,minimum width=14mm,minimum height=10mm] (f) at (28,34) {$f_{\theta}$};
\node (p) at (54,34) {$P_q,P_t,P_a$};
\node[draw,rectangle,minimum width=15mm,minimum height=10mm] (proj) at (80,34) {$\Pi_r$};
\draw[link] (q)--(f);
\draw[link] (f)--(p);
\draw[link] (p)--(proj);
\node[font=\small] at (28,43) {$\theta$ fixed};
\node (guard) at (28,16) {$S(q)\in\{0,1\}$};
\draw[link] (q.south)|-(guard.west);
\draw[link] (guard.north)--node[right,font=\scriptsize] {$S=1$}(f.south);
\draw[link,dashed] (guard.east)--(80,16)--(proj.south);
\node[font=\scriptsize,fill=white,inner sep=1pt] at (57,16) {fallback $M_q$};
\node[anchor=west,font=\scriptsize] at (0,0) {$\widehat M=\Pi_r(P_q,P_t,P_a)$ if $S(q)\land V$; otherwise $M_q$.};
\draw[rule] (95,3)--(95,49);
\draw[->,line width=.5pt] (103,8)--(162,8) node[below] {$x$};
\draw[->,line width=.5pt] (103,8)--(103,46) node[left] {$y$};
\fill[black!7] (131,9) rectangle (159,44);
\draw[dashed,muted] (131,8)--(131,46);
\node[anchor=south,font=\scriptsize] at (131,46) {$x_A+\epsilon_g$};
\draw[fill=black!15,line width=.6pt] (117,25) circle (3.8);
\node at (117,25) {$A$};
\draw[line width=.6pt] (111,37) ellipse (4 and 2.4);
\node[above] at (111,39) {$C_1$};
\draw[teal,fill=teal!14,line width=.8pt] (141,32) ellipse (4.5 and 3);
\draw[teal,fill=teal!14,line width=.8pt] (150,18) ellipse (4 and 2.8);
\node[above] at (141,35) {$C_2$};
\node[above] at (150,21) {$C_3$};
\draw[link] (121,25)--(136,31);
\node[anchor=north,font=\small] at (132,3) {$\mathcal E_{\rightarrow}=\{C_2,C_3\}$};
\end{tikzpicture}
\end{document}