Giant font on the R plots...

Hello,

I've been facing a really stupid problem... When I try to plot using
heatplot or hclust or any similar function, the labels of the x-axis - which
are the samples names - are giant & overlapping. I can't even read the
samples names!

I tried  cex.lab = 0.5, it helped only with the y axis and not the x-axis...
Any help please?!

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