Percent GC-content versus length of intergenic regions (IGRs) in 'Cand. P. ubique'. Transfer and ribosomal RNAs are as annotated by Rfam  and RefSeq (RefSeq accession NC_007205.1). Other structured RNAs include known riboswitches, 4.5S RNA (SRP RNA), RNase P RNA and tmRNA.
Meyer et al. BMC Genomics 2009 10:268 doi:10.1186/1471-2164-10-268