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In Mathematica and given the code below, I am trying to the real part of ##\sigma##, ##Re(\sigma)##, in stead of simply ##\sigma##. Any help would be awesome! Here's what I have:

Code ( (Unknown Language)):

n = 3;

ContourPlot[(\[Sigma]^2 -

2 (n - 1) (2 n + 1) \[Epsilon] \[Sigma] + (n - 1) n (n + 2)) ((

Sqrt[\[Sigma]/\[Epsilon]]

BesselJ[n + 1/2, Sqrt[\[Sigma]/\[Epsilon]]])/

BesselJ[n + 3/2, Sqrt[\[Sigma]/\[Epsilon]]] - 2) +

4 (n - 1)^2 (n + 1) \[Epsilon] \[Sigma] == 0, {\[Epsilon], 0,

1.5}, {\[Sigma], 0, 7}]

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# Mathematica Mathematica Plot Real Portion (Contour Plot)

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