Complete the Following Chart

Essay

Complete the following chart:
$$\begin{array} { | l | c | c } \hline \text { Lead } & \begin{array} { c } \text { Positive } \\\text { Electrode }\end{array} & \begin{array} { c } \text { Heart Surface } \\\text { Viewed }\end{array} \\\hline \mathrm { aVR } & & \\\hline \mathrm { aVL } & & \\\hline \mathrm { aVF } & & \\\hline\end{array}$$