It contains a complete description of a seismograph network for a given starting time. The start time is specified on the first line of a configuration description, although not necessarily the first line of the file. The type and the order of data are specified on the second line of the description. What follows after this two-line preamble are the configuration data, all upper case, which are followed by a closing trailer line. Anything outside the NC description block is considered a comment.
Comments can also trail the data.
Let's look at an example for clarification. This is another comment. The configuration starts on day 78 of year 1996 and ends at day 100 of year 1996. The second description block shows that on day 100 the station B08 had a sensor swapped in and that station B09 came on line. For our Fiji database the filename for our NC file is fiji.nc .