ADS-B Receiver data

I’ve been collecting some data with my Raspberry Pi ADS-B with 1090 Mhz antenna. I’ve follow some instruction from the https://github.com/openskynetwork/raspberry-pi-adsb.
I have follow every step on the website above, until the process come to this step:

~/dump1090/dump1090 --interactive --gain -10 --net --net-beast

and comes with the same result with the header:

Hex     Mode  Sqwk  Flight   Alt    Spd  Hdg    Lat      Long   Sig  Msgs   Ti|

Unfortunately, the website didn’t come with the explanation of meaning of each header. I did’t understand what is Sig Msgs and Ti. Any idea of what is the meaning of these parameter? Thank you.