{TAIL ~ The spectral intensity values} are associated with {HEAD ~ a first spatial dimension} , a second spatial dimension and a wavelength dimension  
{ TAIL ~ The spectral intensity values } are associated with { HEAD ~ a first spatial dimension } , a second spatial dimension and a wavelength dimension
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH