This is a general view of the centre of the south-west cairn, which has been reconstructed for public display and would never have had this configuration in use. The central cist is one of three within the boundary of the cairn. There was an additional stone ovoid at one time, which is not visible on the modern surface. The right-most standing stone is the one marked with pecked spirals.
My previous post on Temple Wood is here, which has a close-up of that stone.
More information on the Temple Wood site can be found at the Canmore website of the Royal Commission on Ancient and Historic Monuments in Scotland (RCAHMS) here. The Canmore ID for the site is 39504.