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Expected output for 'h5diff file1.h5 file2.h5 -n 2 g1/dset3 g1/dset4'
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position        dset3           dset4           difference          
------------------------------------------------------------
[ 0 0 ]          100.000000      110.000000      10.000000      
[ 0 1 ]          110.000000      100.000000      10.000000