Looking at the option chain I see short term (30 days) deep out of the money calls with volume for strike 55 with volume at 16, with Bid/Ask, at the start of day, at 0.45/1.10:

However, the time and sales window notes two transactions that makeup that volume measure:

As evidenced from these two transactions, the first (at 10:36am) transactions bid/ask market spread is 0.45/1.00 while the second (at 10:40am) is 0.40/0.45.

why and how can the the respective transactions markets be so different? Is this evidence that one is Sell to Close, the first at (at 10:36am), and the other is Sell to Open, the second (at 10:40am)?

Looking at the option chain I see short term (30 days) deep out of the money calls with volume for strike 55 with volume at 16, with Bid/Ask at 0.30/1.00:

However, the time and sales window notes two transactions that makeup that volume measure:

As evidenced from these two transactions, the first (at 10:36am) transactions bid/ask market spread is 0.45/1.00 while the second (at 10:40am) is 0.40/0.45.

why and how can the the respective transactions markets be so different? Is this evidence that one is Sell to Close, the first at (at 10:36am), and the other is Sell to Open, the second (at 10:40am)?