[R] Help with subtitle for Barplot

[Li, Shaorong]

 <<Barplot_qpcr_Isabella_Dce08_SL_cal5.r>>  <<qpcr_barplot.txt>>  
<<plot2_JS-W2_HKG21-Cal5.pdf>> 

I attached the R code,  data and plot. I am wondering why I couldn't get
subtitle showing up under each plot even though I didn't get any error
message. 

Thanks for help in advance,
Shaorong
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