Natal chart interpretation
Taking an in-depth look at your natal chart with the predominant focus on ascertaining what your current life's theme is.
In this reading, I would cover the main aspects of the North and South Nodes, your Chiron placement, and any Stelliums or prominent energies and determine the main lesson within this lifetime.
natal chart interpretation extended
The extended version would include all of the original interpretation, but would then go further into detail about all the sign and house placements within the chart, so as to fully understand the inherent characteristics you were born with and thus how to utilise them.