What is the fine-grained topic of the following text: Highlights included unique double-hinged 'kinematic' pillarless doors allowing easy access to the front and rear seats (even when tightly parked), the world's largest opening glass sunroof at the time (a full 1m/sq of opening roof) featuring strengthened heat-reflecting glass, theatre seating (rear positioned higher than the front), galvanised steel chassis with aluminium upper structure, a cavernous 530 litre boot, xenon headlights, a 'grand air' button which simultaneously opened all pillarless windows and sunroof, and finally a choice of powerful engines (3.0 V6 or 2.0 turbo) giving a grand tourer driving style and claimed lowest 0-62mph of 8.6 seconds. Only return the topic.
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