All Records (default) - this option will include all
data records in your downloaded data file, regardless of what
parameters they contain. All records have latitude and longitude
but any one record may or may not have values for various data
parameters.
Only Records with Parameters selected below - You can
choose one or more geophysical parameters. Your downloaded data
file(s) will only contain records which have values for the parameters
you choose.
(Note: to select specific parameters to download, click on them with the mouse. Control+Click selects additional fields without unselecting selected fields, Shift+Click extends the selection range. You may also Click+drag the mouse for multiple selections.)