Option contract code, in ticker.region format
Expiry date, in US Eastern time
Strike price
Contract direction
Special expiration cycle of the contract
Whether the contract is a legacy contract left over from a corporate action
Number of days remaining until the option expires, 0 on the expiry
day and negative once expired
A single option contract of an option chain
Every contract is an independent entry: calls and puts are not paired, so a strike price that is listed on one side only yields a single entry.