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\section{Appendix}  The electron cyclotron frequency is given by \[\omega_{ce}=\frac{eB}{m}\] where $e$ is the elementary charge,$B$ is the magnetic field and $m$ is the electron mass.  The plasma frequency is given by \[\omega_{pe}=\sqrt{\frac{ne^2}{m\epsilon_0}}\] where $n$ is the plasma density,and $\epsilon_0$ is the permittivity of free space. The voltage measured by the bdot probe is given by \[V_{measured}=N_{loop}A\frac{\partial\vec{B}}{\partial t}\]