\begin{figure}[h!]
\centering
-\includegraphics[scale=0.5]{Figures/ch2/GAF1.jpeg}
+\includegraphics[scale=0.8]{Figures/ch2/GAF1.jpeg}
\caption{ Example of fixed square grid in GAF.}
\label{gaf1}
\end{figure}
-The fixed grid is defined where, each two adjacent grids, for example, A and B in figure\ref{gaf1}, all the sensor nodes inside A can communicate with sensor nodes inside B and vice versa. Therefore, all the sensor nodes are equivalent from the point of view the routing. The size of the fixed grid is based on the radio communication range $R_c$. It is supposed that the fixed grid is square with $r$ units on a side as shown in figure~\ref{gaf1}. The distance between the farthest two possible sensor nodes in two adjacent grid such as, B and C in figure~\ref{gaf1}, should not be greater than the radio communication range $R_c$ so as to satisfy the definition of fixed square grid. For instance, the sensor node \textbf{2} of grid B can communicate with the sensor node \textbf{5} of grid C. So,
+The fixed grid is defined where, each two adjacent grids, for example, A and B in figure\ref{gaf1}, all the sensor nodes inside A can communicate with sensor nodes inside B and vice versa. Therefore, all the sensor nodes are equivalent from the point of view the routing. The size of the fixed grid is based on the radio communication range $R_c$. It is supposed that the fixed grid is square with $r$ units on a side as shown in figure~\ref{gaf1}. The distance between the farthest two possible sensor nodes in two adjacent grid such as, B and C in figure~\ref{gaf1}, should not be greater than the radio communication range $R_c$ so as to satisfy the definition of fixed square grid. For instance, the sensor node \textbf{2} of grid B can communicate with the sensor node \textbf{5} of grid C So,
\begin{eqnarray}
r^2 + \left(2r \right)^2 \leq R_c^2
\begin{figure}[h!]
\centering
-\includegraphics[scale=0.5]{Figures/ch2/GAF2.jpeg}
+\includegraphics[scale=0.8]{Figures/ch2/GAF2.jpeg}
\caption{ Example of fixed square grid in GAF.}
\label{gaf2}
\end{figure}
\begin{figure}[h!]
\centering
-\includegraphics[scale=0.5]{Figures/ch2/DESK.jpeg}
+\includegraphics[scale=0.6]{Figures/ch2/DESK.jpeg}
\caption{ DESK network time line.}
\label{desk}
\end{figure}
