Final answer:
The roof shape is NOT a difference between Doric and Ionic temple formats, as both styles can have similar roof designs; the main differences are in column capital design and entablature features.
Step-by-step explanation:
The question asks about the differences between Doric and Ionic temple formats. The option that is NOT a difference between the two styles is d. Roof shape. Both styles differ in terms of column capital design, with the Doric order having a plain capital and Ionic possessing more elaborate capitals. The entablature features also differ as the Doric entablature has a frieze composed of triglyphs and metopes, while the Ionic order has a continuous frieze that often features scroll-like volutes. Regarding the number of columns, while both can vary, this is not a distinct difference attributable to the styles themselves but rather to the specific design choices of a particular temple. The roof shape however is not typically a defining feature used to distinguish between the two orders, thus making it not a difference between Doric and Ionic temple formats.