deletions | additions       diff --git a/From_the_upper_right_plot__.tex b/From_the_upper_right_plot__.tex  index e9b3f4d..7d38f29 100644  --- a/From_the_upper_right_plot__.tex  +++ b/From_the_upper_right_plot__.tex 
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From a statistical point of view, this problem can be thought of a an example of 'structural equation modelling' where the measurable manifest variables $dP$ and $dU$ are functions of the unmeasurable, latent variables $dP_+$ and $dP_-$ through a network of equations and the unknown parameter $c$. This interpretation of the method has not been exploited but may cast some light on the empirical method proposed here. [This comment should be moved to the Introduction??]  The next step in the method is to calculate the variables $dP_+$ and $dP_-$ for the assumed value of $c$. The resultant pdfs for $dP_\pm$ are shown in Figure 3.