The current monthly file is appended to daily. The file names are self explanitory. The files A98.txt, A99.txt and A00.txt contain the concatenated daily files for those years. The files are concatenated in numerical order - not date order. In each case the counting interval is 900 seconds and the counts are prescaled by 100.
File names are in the form yyyyMMmb.txt.
There are 14 columns with headings. There are 11 columns without headings. Column 1 seconds since midnight on 1 Jan 1999. In each case the counting interval is 900 seconds. Rates are in counts per second.