I'm using the `POT` Package in R for fitting a Generalized Pareto distribution to my data. For choosing an approximate threshold I'm using the `tcplot()` and `mrlplot()` the following way(`x` is the data containing vector)

    tcplot(x,u.range=c(0,quantile(x,probs=0.995)))
    mrlplot(x,u.range=c(0,quantile(x,probs=0.995)),col=c("green","black","green"),nt=200 )

But I get a bit confused sometimes as what value I'll choose as threshold. Particularly as mentioned in this site that 

> interpretation of these plots often requires a good deal of
> subjective judgement

http://www.bioss.ac.uk/people/adam/teaching/OR_EVT/2007/node23.html

For example what would be the threshold given the following plot? 
![A parameter stability and MRL plot][1]


  [1]: https://i.sstatic.net/f3oZh.png