deletions | additions       diff --git a/layout.md b/layout.md  index 1e1bf2e..af32c97 100644  --- a/layout.md  +++ b/layout.md 
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figures/tightbinding2/tightbinding2.png  At_the_band_center_the__.tex  figures/tightbinding3pdf/tightbinding3pdf.png  section_Density_of_states_In__.tex