Added 1) Spectroscopy and 2) Schlieren imaging examples

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+Summary of things to ask students to do:  
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+- Read density images (txt files) into Python
+- Compute density gradient at each pixel in the image for a bunch of images
+- Make schlieren movie out of the density gradient files
+- For density images between 1 - 10 us cut the image over the central plane of the kernel and plot Density vs. Radius. Obtain Temperature vs. Radius for a given pressure of 1 atm using equation of state.
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+
+Read density data.
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+Compute density gradient for each
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+Make Schlieren image for each
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+