Snap Quote UI in Nest Trader

The above is quote of USDINR currency derivative. Can someone please explain what the highlighted numbers are ? My understanding is that the top highlighted line tells that 0.3950 is the bid price , but I am confused if 400 is number of lots or individual options ? And what is 2 ?
Similarly is TBQ value (562) , the # of lots or options ?

Apart from this, I have recently started learning about trading.
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the 400 part ,.. is the top bid available at that time.

TBQ = total buy quantity ,.. which means there r 562 lots pending as resting limit orders including 400 on top.
TSQ = total sell quantity...

Hope this clears ur mind abit ,..

Have fun and best wishes for ur learning and trading ,...

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