diff --git a/xrd/plots.R b/xrd/plots.R
index 977ef02..742ef25 100644
--- a/xrd/plots.R
+++ b/xrd/plots.R
@@ -4,7 +4,7 @@ grease_count = read.table("grease.tab")
 plastic_count = read.table("plastic.tab")
 wood_count = read.table("wood.tab")
 
-plot(x=x,y=plastic_count[,1],pch='-',log="x",ylab=expression(count),xlab=expression(2~theta~degree~")"),xlim=c(12,55))
+plot(x=x,y=plastic_count[,1],pch='-',log="x",ylab=expression(count),xlab=expression(2~theta~degree),xlim=c(12,55))
 abline(v=42.5)
 axis(3,at=42.5)
 abline(v=30.5)
@@ -17,7 +17,7 @@ dev.print(pdf,"../report/plastic_peaks.pdf",width=3,height=3)
 
 
 
-plot(x=x,y=grease_count[,1],pch='-',log="x",ylab=expression(count),xlab=expression(2~theta~degree~")"))
+plot(x=x,y=grease_count[,1],pch='-',log="x",ylab=expression(count),xlab=expression(2~theta~degree))
 abline(v=12)
 axis(3,at=12)
 abline(v=22)
@@ -25,7 +25,7 @@ axis(3,at=22)
 dev.print(pdf,"../report/grease_peaks.pdf",width=3,height=3)
 
 
-plot(x=x,y=wood_count[,1],pch='-',log="x",ylab=expression(count),xlab=expression(2~theta~degree~")"),xlim=c(15,55))
+plot(x=x,y=wood_count[,1],pch='-',log="x",ylab=expression(count),xlab=expression(2~theta~degree),xlim=c(15,55))
 abline(v=16)
 axis(3,at=16)
 abline(v=22.5)