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(corresponding to numbers on rectangles): 1 Rignot and Thomas 2002; 2 Ramillien and others 2006; 3 Velicogna and Wahr 2006; 4 Chen and others 2006; 5 Zwally and others 2005; 6 Wingham and others 2006; 7 Rignot and others 2007 Rignot, E. and Thomas, R. (2002). Mass balance of polar ice sheets. Science, 297(5586), 1502-1506 Ramillien, G., Lombard, A., Cazenave, A., Ivins, E., Remy, F. and Biancale, R. (2006). Interannual variations of the mass balance of the Antarctic and Greenland ice sheets from GRACE. Global and Planetary Change, 53, 198-208 Velicogna, I. and Wahr, J. (2006a). Measurements of time-variable gravity show mass loss in Antarctica. Science, 311(5768), 1754-1756 Chen, J., Wilson, C., Blankenship, D. and Tapley, B. (2006a). Antarctic mass rates from GRACE. Geophysical Research Letters, 33, L11502 Zwally, H.J., Giovinetto, M.B., Li, J., Cornejo, H.G., Beckley, M.A., Brenner, A.C., Saba, J.L. and Yi, D. (2005). Mass changes of the Greenland and Antarctic ice sheets and shelves and contributions to sea-level rise: 1992-2002. Journal of Glaciology, 51(175), 509-527 Wingham, D., Shepherd, A., Muir, A. and Marshall, G. (2006a). Mass balance of the Antarctic ice sheet. Transactions of the Royal Society of London Series A, 364, 1627-1635 Rignot, E., Arthern, R., Bamber, J., van den Broeke, M., Davis, C., Li, Y., van de Berg, W.J. and van Meijgaard, E. (2007). A net source of ocean mass from coastal thinning of Antarctic glaciers. In print