Chromatographic fluorescence data from Bro et al. J. Chemom, 1999.

X contains the 28 x 15 x 20 x 39 spectral data in 
a 28 x 11700 matrix. To convert to a four-way array 
in MATLAB 5 and higher type <X = reshape(X,DimX)>.

For further info see above reference or
http://www.models.kvl.dk/users/rasmus/