This is great!! It is also tricky!!! The problem lies in the choice of
ylim. And looking at the data and choosing ylim based on the maximum and
minimum values of y is a waste of time. And choosing it by other means was
yet much more difficult.
I had to start plotting part of the data with incremental step of 80 data
points and manually varying ylim till I got to the last data point 1136,
where I finally used ylim=c(150000,162000) which has nothing to do with the