Opened "TEST.h5" with sec2 driver.
Monitoring dataset /DSET_CMPD...
dimension 0: 10->13 (increases)
    Data:
        (10) {field1=1, field2={a=2, b={a=2, b=2, c=2}, c=2}, field3=3, 
        (10)  field4={a=4, b=4}},
        (11) {field1=2, field2={a=3, b={a=3, b=3, c=3}, c=3}, field3=4, 
        (11)  field4={a=5, b=5}},
        (12) {field1=3, field2={a=4, b={a=4, b=4, c=4}, c=4}, field3=5, 
        (12)  field4={a=6, b=6}}