fio output-format=json+ and latency histogram buckets ~1200

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Hi,
Can someone please explain what is the detailed latency buckets using
--output-format=json+ depict? The are always ~16 buckets populated. I
am not able to figure out the # iops per latency buckets and what the
units of latency are?

Another question:
For the histogram latency there are ~1200 buckets which can track
16sec for max latency. Can someone please explain what each bucket
interval. e.g. assuming each is 10us increment.
0-10us [#IOPS]
10-20us[#IOPS]
20-30us..[#IOPS]
......
15-16sec
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productive outputs!!
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