resize and adjust the heatmap in heatmap.2

resize and adjust the heatmap in heatmap.2

I generate a heatmap like this:
The X-axis and Y-axis label doesn't show completely. My code is here:
heatmap.2(x,col=blueyelred,colsep=c(1:6),rowsep=(1:62),sepwidth=c(0.05,0.05),sepcolor="white",trace="none",Rowv=F,Colv=F,scale="none",dendrogram="none",key=F,lhei
= c(0.05,5),margins=c(1,8))
Is there any way to adjust it.
Thanks! Cam