multiple plot lines with plot '-'

[<pl...@pi...>]

HI,

I am plotting some data from a data file with four columns to produce 
three plot lines.

set timefmt "%d.%m.%y:%H:%M"; set xdata time
plot  "fast.log" using 1:2 t "systolic" w l,  "fast.log" using 1:3 t 
"diastolic" w l, "fast.log" using 1:4 t "pulse" w l


To save having a separate gnuplot script file I was trying to put these 
two lines at the head of the data and use the plot '-' feature. But this 
involves reading the data three times and I can't see how to do it.

Before suggesting ways this could be improved I was wondering whether I 
was missing a trick.

Thanks. Peter.