if ~exist('waterpipesDone') then
 display 'first execute waterpipes.pcm'
 return
endif
clear
window 0
defaults
!
set plotsymbol -14
scales\commensurate 0 100 0 100
graph\overlay x y
set
 curvecolor blue
 plotsymbol 0

generate v 0,,100 50
graph\overlay v a*v+b
do i=[1:len(x)]
  v = (1/a)*(y[i]-b-(y[i]-b-a*x[i])/(a*a+1))
  w = a*v+b
  graph\overlay [x[i];v] [y[i];w]
enddo
set
 %textheight 5
 textalign 2
 textinteractive 0
 %xtextlocation 50
 %ytextlocation 90
 
text 'Total length of pipe = '//rchar(psum,'%4.2f')