Hi,

I am trying to change the values of the tick marks on the xaxis of the 
following multipanel plot (see relevant bits of script below) to increments of 
50 or to a custom scale (ie. 50, 100, 150, 200, 300...).
So far I tried using xaxp or xlim both in par() or lineplot.CI(), as well as 
axTicks and axisTicks but did not get it to work.
Suggestions?

#Plots average A/Ci for each day from ACi
#Parameters of the panels
par(mfcol=c(3,2), #row,col
    mar=c(2,2,1,1), #inner margin (bottom, left, top, right)
    oma=c(4,4,1,1), #outer margin (bottom, left, top, right)
    omd=c(0.1,0.8,0.1,0.95), #outer dimensions, values {0-1}, (x1, x2, y1, y2)
    xpd=NA)

...


#PAR = 1000, Day2
with(subset1000_2,
     lineplot.CI(x.factor=Ci.average,
                 response=Photo,
                 group=Treatment,
                 ylab=NA,
                 xlab=NA,
                 legend=FALSE,
                 type="p",
                 x.cont=TRUE, #continuous x axis (spacing proportional to 
values)
                 ylim=c(1,45), #range y axis
                 err.width=0.05,
                 pch = c(16,16,16), #symbols shape
                 col=c("gray84","black","gray48"),
                 fun=
     ))
mtext("Day2, PAR=1000", side = 3, line= -1, adj=0, at=1, cex=0.6) #subtitle

....

#legends
mtext("Ci", side = 1, line= 1, outer = TRUE, cex=0.7) #x legend
mtext("Photosynthetic rate", side = 2, line= 1, outer = TRUE, cex=0.7) #y legend
Thank you kindly for your support.

Clemence

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