[R] need tick marks by 10s or 20s up to 200 on x axis

[juliemcwh]

Sorry, I have read other posts on tick marks but nothing is working.

Here is my R code.  I was able to turn off the x axis at one point (I
removed that code), but never got the tick marks on by 20s.  It always goes
to the default of 50, 100, 150, 200.

Thanks.

R code: hist(OMY$FL, main = "2010 Oncorhynchus mykiss Fork Length
Frequencies at Buck Creek Reach 1", include.lowest = TRUE, col = "blue",
border = "white", breaks = 140,
xlab = "Fork Length  in  mm", ylab = "Frequency", xlim = range(0,200), ylim
= range (0,15), xbar=10)
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