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What does "absent" mean on some fields of the radiotap header?

Hi,

To see the detailed PHY information of the 802.11ac packets, I am using wireshark to parse the .pcap file, which is captured by tcpdump.

However, some of my interested fields under radiotap header appear to be "absent". By "absent", I cannot know whether it means true or false.

So what does "absent" exactly mean? Can I interpret that as false?

Yanbo