The file "upper_limits.csv" contains upper limits produced from analysis of S5 data. See LIGO publication LIGO-P1100029-v36. First line gives the name of each column. The data in columns is separated with [TAB]. Column key: "band" - start of 0.25 frequency band for which upper limit is established (Hz) "first_bin" - same in units of (1/1800 Hz) "ul" - upper limit (strain) "ul_circ" - upper limit assuming circularly polarized source "60hz" - this band is near 60 Hz harmonic and is considered contaminated "non_gaussian" - this band failed Gaussianity test If you are using R (http://www.r-project.org) the data can be read in with UL<-read.table("upper_limits.csv", header=TRUE, sep="\t")