Unit: dollars/ ton 
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LME 3-month Futures    LME Spot/3-month B/C
Copper   7405.0/7408.0 127 b
Zinc     1985.0/1990.0 11 b
Lead  1680.0/1686.0 -13 c 
Aluminium  2852.0/2859.0 -49 c 
Nickel 17841.0/17940.0 -90 c 
Tin 18550.0/18650.0 -70 c
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c for contango£¬b for backwardation