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Data points can be presented either by symbols or by connecting lines
with the routine `PCDATA` (`PTDATA`) . The
coordinates of the data ponits are expected to refer to the current
graphic mode, *i.e.* `USER` (world) coordinates or `NORM`alized (clip) coordinates. `PCDATA` (`PTDATA`) connects
the data points with lines if the line type is not equal to zero, else
it will present the data points with symbols. `PCDATA` (`PTDATA`) produces a simple staircase if the bin mode flag is set.
Data can also be represented by a histogram using `PCHIST` (`PTHIST`).
It offers some sophisticated options so you can draw a histogram according
to your taste.