Is market price or last price used in charts ?

When closing my positions I have the option of using last price or market price. I simply want to use whatever is shown in the candle charts...
Let's say a candle chart shows me a recent high at 1000, does that mean the last price was 1000 at that time, or the market price was 1000 at that time ?

Maybe the charts can be displayed as "last price charts" or "market price charts" ?

thank you :)
OHLC Open high low close. The close is often the default. You should not only ask yourself this but you need to know where price comes from on these charts. Some charts are generated from bid prices. Some are generated by close prices or otherwise.