The phrase "are best shown" is correct and usable in written English.
It can be used when indicating that something is most effectively demonstrated or illustrated in a particular way.
Example: "The results of the experiment are best shown through a series of detailed graphs."
Alternatives: "are most effectively demonstrated" or "are ideally illustrated."
You can argue that works of art are best shown in their place of creation.
The bare-bones style of MacLeod's writing (which has not significantly changed over the course of 30 years) and his habit of heaping detail upon detail like stones on a cairn are best shown by quotation.
But even when the zombie apocalypse rages around the globe and threatens to wipe out the human species, its effects are best shown with a Chekhovian closeness — say, around a specific breakfast table or in the back seat of a specific family station wagon, where a doting and affable Aunt Betty turns suddenly bad and chomps a huge glob of flesh out of the nearest relative's face.
This provides a clearer scan of the retroperitoneal space (Fig. 1), by sliding the probe for the upper right and left postero-lateral thoraco-abdominal junction zone, although the pararenal spaces are best shown transverse epigastric view (Fig. 2).
If the product has any problems with glass, these problems are best shown with straight-on or oblique backlighting.
Because of its breadth and variety, such a framework is best shown by examples.
The tragic irony of this is best shown in my own favourite among the plays: Ron Hutchinson's Durand's Line.
This is best shown by the secret agreement he and Herbert Gladstone, son of the former Liberal leader, made in 1903.
Passion is best shown through sincerity, and a vac scheme application full of empty statements and declarations of "a love of the firm" can be seen through easily.
The quality of pictures on the iPad is amazing, which is best shown by the Mario Testino footage on the Vogue app".
