## S3 method for class 'colorSpec':
extradata(x)
extradata(x) <- valuedata.frame with m rows, where m is the number of spectra in x.extradata returns a data.frame with m rows,
where m is the number of spectra in x.
The rownames are set to the specnames of x.
If there is no extra data then the number of columns in this data.frame is 0.organization of x is not 'df.row',
then extradata cannot be stored in x and the assignment is ignored, with a warning.
First change the organization to 'df.row', and then assign the extradata.
If the organization of x is "df.row", but value does not have
the right number of rows, the assignment is also ignored.colorSpec,
organization