At the top of the column, fuel gas and liquefied petroleum gas (or LPG) is produced. A little lower down the column, gasoline (or, more precisely, one of the blending stocks for gasoline called naphtha) is withdrawn. Still lower down the column, jet fuel and diesel fuel are produced.

At the very bottom of the column, asphalt is the "bottom of the barrel". Asphalt can either be sold to make roads and roofing materials, or it can be thermally cracked in a coker, where under high temperatures, the asphalt breaks down into a synthetic crude oil, producing the same products as crude oil as well as petroleum coke. Similar columns are found at all the cokers.

Between asphalt and diesel fuel is a substance called gasoil. In some refineries, this stream can be further processed into lubricating oil. However, the crude oil that FHR processes doesn't make very good lubricating oil, so like asphalt it is catalytically cracked into another synthetic crude oil. Again, similar columns are found in the catalytic cracking unit.

More information can be found at the DOE and EPA Web sites.