deletions | additions       diff --git a/past light cones.tex b/past light cones.tex  index 7eff060..b541aef 100644  --- a/past light cones.tex  +++ b/past light cones.tex 
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if you’re inside the singularity (r = 2M) then outgoing rays  \bullet{curve \bullet curve  to the positive side on the outside} outside    \bullet{curve to the negative side if inside}