deletions | additions       diff --git a/Methodology Measurements TTC.tex b/Methodology Measurements TTC.tex  index 1b553b1..f3d3763 100644  --- a/Methodology Measurements TTC.tex  +++ b/Methodology Measurements TTC.tex 
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Time-to-collision is measured instantaneously: a new value of TTC may exist for every interaction-instant. Thus, a pair of users may have a time series of TTC observations evolving over time. Some efforts have been made to study these evolutions microscopically [CITE]. Other approaches focus on minima or quantile observations [CITE], while others still attempt to examine step-by-step risk.  TTC distributions are generally gamma-like-shaped across the literature. Quantifying TTC risk is the remaining puzzle piece. TTC thresholds have been popular, though are subject to arbitrary selection. One recent approach proposed a shifted gamma-generalised pareto distribution model \cite{Zheng_2014}.  In the meantime, some qualitative analysis is possible in some circumstances, for example as demonstrated in \ref{fig:distro-comparison}.