Charts show the Bid price only so should not be relied on solely to determine the actual market Offer.

The spread must also be considered within the context of different order types and how they are triggered:

For a Buy Limit, the market has to be Offered at, or below, your chosen level.
For a Sell Limit, the market has to be Bid at, or above, your chosen level.
For a Buy Stop, the market has to be Offered at, or above, your chosen level.
For a Sell Stop, the market has to be Bid at, or below, your chosen level.

To view the Offer price on your chart, you can use Custom Indicators that are available to show the Offer on your chart.