just a question: the top yellow part of the Silhouettes (take the example of those in the book and site) count to see if there´s vision ?
No, it's ONLY the rectangular part (not the angled top area with the S sizing on it) down to the bottom of the "base". The measurements they give for them don't include that top area.
This seems a good place to say I find having plenty of silhouette markers to hand absolutely essential to a good game of Infinity. They make positioning models easy, and provide grace and ease to find LoF for both players. You can simply use model bases for positioning, but you need the silo’s for LoF anyway. For importance, I put them right up there after models, dice and tape measure; and alongside teardrop and circular templates. Do not leave home without at least one set!