Toxic Chemical Production Data
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Artificial data record the volume of a toxic chemical 
that is produced as a by-product in a certain industrial
manufacturing process.

The file toxic.dat contains these variables:

VOL     The volume of toxic by-product produced (in litres)
TEMP    The temperature of the manufacturing process (in^oC)
CAT     The weight of catalyst (in kg)
METHOD  The method used to produce the chemical (qualitative)