R version 3.0.2 (2013-09-25) -- "Frisbee Sailing"
Copyright (C) 2013 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)

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> x <- c(19064,18993,18921,18772,20246,20168,19064,18330,18401,18401,18480,18622,18843,18843,18701,18330,20246,20538,20097,19064,19506,18843,19142,19285,19434,19064,19142,18622,20246,20759,20318,19506,20389,19434,20318,20246,20467,19655,20538,20467,21792,21493,20318,19726,20538,19434,20246,20389,20688,20026,20389,20610,21422,20759,19876,18921,19805,17375,18551,19213,19876,18921,18921,18921,19434,18701,17739,16934,17518,15238,16635,17447,17596,16784,16855,16635,17375,16855,15830,15089,16342,13621,15388,16193,16193,15238,14355,14284,15089,14355,12959,11997,13030,10601,12809,13984,14355,13543,12517,13251,13543,13322,11113,10088,10821,8613,10893,11705,12367,11263,10230,10821,11113,10529,8321,7359,8242,5813,8463,10088)
> par20 = ''
> par19 = ''
> par18 = ''
> par17 = ''
> par16 = ''
> par15 = ''
> par14 = ''
> par13 = ''
> par12 = ''
> par11 = ''
> par10 = ''
> par9 = ''
> par8 = ''
> par7 = ''
> par6 = ''
> par5 = ''
> par4 = '12'
> par3 = 'Omzet druif per maand in euro'
> par2 = 'niet gekend'
> par1 = 'Omzet druif (EUR)'
> main = 'Omzet druif per maand (EUR)'
> if (par4 != 'No season') {
+ par4 <- as.numeric(par4)
+ if (par4 < 4) par4 <- 12
+ }
> summary(x)
   Min. 1st Qu.  Median    Mean 3rd Qu.    Max. 
   5813   14210   18520   16780   19670   21790 
> n <- length(x)
> postscript(file="/var/wessaorg/rcomp/tmp/1cqku1407093544.ps",horizontal=F,onefile=F,pagecentre=F,paper="special",width=8.3333333333333,height=5.5555555555556) 
> if (par4=='No season') {
+ plot(x,col=2,type='b',main=main,xlab=xlab,ylab=ylab,xaxt='n')
+ axis(1,at=seq(1,n,10))
+ }
> if (par4!='No season') {
+ plot(x,col=2,type='b',main=main,xlab=xlab,ylab=ylab,xaxt='n')
+ axis(1,at=seq(1,n,par4))
+ grid(nx=0,ny=NULL,col='black')
+ abline(v=seq(1,n,par4),col='black',lty='dotted')
+ }
Error in plot.default(x, col = 2, type = "b", main = main, xlab = xlab,  : 
  object 'xlab' not found
Calls: plot -> plot.default
Execution halted