Bilateral Graph

http://kcdb.bipm.org/AppendixB/KCDB_ApB_result_dtl.asp?cmp_idy=58&cmp_cod=BIPM%2EEM%2DK11%2Ea&search=1&cmp_cod_search=&page=1&met_idy=3&bra_idy=8&epo_idy=0&cmt_idy=0&ett_idy_org=0&lab_idy=&rta_idy=1829&rta=ge

Bilateral graphs shows increases on one side of a zero line and decreases on the other. These graphs are very usefull when data needs to be presented or analyzed using both positive and negative values. The best guess as to what this graph is analyzing is a type of diode being testing showing results in micro-volts. The labels on the x-axis are the labs which conducted the experiment. So this graph is a comparison of different labs and their results after the experiment. The different colors represent when the experiment was carried out using different uncertainties in the calculations and other standards.