include the point numbers in the mdf file
(NB these can be different from the time/frame points)
include.channel
include channel information
generate.unique.ids
combine cluster and id columns to get unique ids
text
character string: if file is not supplied and this is, then data
are read from the value of text via a text connection. Notice that a literal
string can be used to include (small) data sets within R code.
fileEncoding
character string: if non-empty declares the encoding to
be used on a file (not a connection) so the character data can be re-encoded
as they are written. See base::file().