-We chose as energy consumption model the one proposed proposed \linebreak\r
-by~\cite{ChinhVu} and based on ~\cite{raghunathan2002energy} with slight\r
-modifications. The energy consumed by the communications is added and the part\r
-relative to a variable sensing range is removed. We also assume that the nodes\r
-have the characteristics of the Medusa II sensor node platform\r
-\cite{raghunathan2002energy}. A sensor node typically consists of four units: a\r
-MicroController Unit, an Atmels AVR ATmega103L in case of Medusa II, to perform\r
-the computations; a communication (radio) unit able to send and receive\r
-messages; a sensing unit to collect data; a power supply which provides the\r
-energy consumed by node. Except the battery, all the other unit can be switched\r
-off to save energy according to the node status. Table~\ref{table4} summarizes\r
-the energy consumed (in milliWatt per second) by a node for each of its possible\r
-status.\r
+We chose as energy consumption model the one proposed\r
+by~\cite{ChinhVu} and based on ~\cite{raghunathan2002energy} with\r
+slight modifications. The energy consumed by the communications is\r
+added and the part relative to a variable sensing range is removed. We\r
+also assume that the nodes have the characteristics of the Medusa II\r
+sensor node platform \cite{raghunathan2002energy}. A sensor node\r
+typically consists of four units: a MicroController Unit, an Atmels\r
+AVR ATmega103L in case of Medusa II, to perform the computations; a\r
+communication (radio) unit able to send and receive messages; a\r
+sensing unit to collect data; a power supply which provides the energy\r
+consumed by node. Except the battery, all the other unit can be\r
+switched off to save energy according to the node status.\r
+Table~\ref{table4} summarizes the energy consumed (in milliWatt per\r
+second) by a node for each of its possible status.\r