Can Tick Stream Really Have More Than one Bid / Ask?

[NewestTrader]

Hi,

I have a general question regarding what I find in the OANDA v2.0 description:

http://developer.oanda.com/rest-live-v20/pricing-df/#collapse_definition_1

# 
    # The list of prices and liquidity available on the Instrument’s bid side.
    # It is possible for this list to be empty if there is no bid liquidity
    # currently available for the Instrument in the Account.
    # 
    bids : (Array[PriceBucket]),

    # 
    # The list of prices and liquidity available on the Instrument’s ask side.
    # It is possible for this list to be empty if there is no ask liquidity
    # currently available for the Instrument in the Account.
    # 
    asks : (Array[PriceBucket]),

When I execute the referring curl example, sofar I only got one entry in this arrays back.

My question is: Does it really happen to have more than one bid or more than one ask in this reply? Or was I mistaken because I was checking the responses during low trading times?

Thanks in advance!

[backtrader]

At a single instant in time, there should only be one bid/ask pair. If we forget that there is a complete ladder of bid/ask prices, which are waiting to be first on the queue.