... predicted by the value in Table 1, the improvement is drastic when ¯w goes from 0 to 0 .1 and then starts to saturate b etween 0 .1 and 0.5.Third, according to Table 1, the product Nwµ2wis equal to ... Reson. Med. 61, 10 3 11 6 (2009) 17 . Usman, M, Prieto, C, Schaeffter, T, Batchelor, P: k-t group sparse: A method for accelerating dynamicMRI. Magn. Reson. Med. 66, 11 63 11 76 (2 011 ) 18 . Liang, D, ... Anal. 43, 12 69 12 81 (2 011 )37. Tropp, JA: Improved analysis of the subsampled randomized Hadamard transform. Adv. Adapt. DataAnal. 3 (1 2), 11 5 12 6 (2 012 )38. van den Berg, E, Friedlander, MP:...