Hi, I have finally managed to set up a basic diagram for my needs and would now like to make that a bit nicer but dont find the appropiate answers through wiki or the manual. First of all i have a plot for the X and Y axis - and would like to show the ticks in 2 steps, not in 5 steps, but dont understand how.. The other question might be more tricky. As i work with circles and need to find the best fit - or rather the best intersections of all circles - i would like to automate that, but wouldnt know how and would like to know if there is something like intersect(circle1, circle2, circle3...) that colors the intersection or returns a mean x,y coordinate. As for the code: Thats my current base ---snip require ("plotrix") #Erstelle eine Skala op <- par(xaxs = "i", yaxs = "i", tcl = 0.35) x <- c(7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31) plot(x,x,type="n",xlab="Temperatur (C)",ylab="Temperatur (C)",main="Site 6") #Gitternetz grid(nx = NULL, ny =NULL, col = "lightgray", lty = "dotted", lwd = NULL, equilogs = TRUE) i<-30 #Gruppen von Foraminiferen #ruber (TB 12-24) draw.circle(18,18,6,border=614,lty=1,lwd=1) text (30, i , labels ="Ruber", col=614, adj=1) #sacculifer (TB 14-26 ) draw.circle(20,20,6,border="green",lty=1,lwd=1) text (30, (i=i-1) , labels ="Sacc", col="green", adj=1) #pachydermaL (TB 6-20) # draw.circle(13,13,7,border="blue",lty=1,lwd=1) #text (30, (i=i-1) , labels ="Pachy L", col="blue", adj=1) #pachydermaR (TB 10-22) draw.circle(16,16,6,border="purple",lty=1,lwd=1) text (30, (i=i-1) , labels ="Pachy R", col="purple", adj=1) #dutertrei (TB 22-24) # draw.circle(21,21,1,border="cyan",lty=1,lwd=1) #text (30, (i=i-1) , labels ="Duter", col="cyan", adj=1) #menardii/tumida (TB 12-24) draw.circle(17.5,17.5,5.5,border="mediumvioletred",lty=1,lwd=1) text (30, (i=i-1), labels ="Men/Tum", col="mediumvioletred", adj=1) #bulloides (TB 10-20) draw.circle(15,15,5,border="skyblue4",lty=1,lwd=1) text (30, (i=i-1) , labels ="Bull", col="skyblue4", adj=1) #inflata (TB 10-26) draw.circle(16.5,16.5,6.5,border="orangered",lty=1,lwd=1) text (30, (i=i-1) , labels ="Infl", col="orangered", adj=1) -------snip -- View this message in context: http://n4.nabble.com/Beginner-questions-plot-circle-tp1018350p1018350.html Sent from the R help mailing list archive at Nabble.com.