Just played the tutorial a couple of times this evening, but we all did have the same question :

What is the "Arc of Fire" for the large figures? Or is there even an arc of fire for them?

It ain't mentioned in the chapture about LOS. Only that you can choose from where you draw your lines for LOS. So, the figures all attack 360° (range an melee), but does this also count for the large figures like the EM-Engineers (Empire) or the AT-ST?

There is no arc.

LTP guide page 6:

When performing a ranged attack, follow these restrictions:

•Line of Sight: To declare the attack, the target figure must be in line of sight of the attacking figure. To determine if a target is within line of sight, the attacking player chooses one corner of his figure’s space. Then he traces two straight, uninterrupted lines to two different corners of the target’s space. These lines cannot overlap and cannot be traced through walls (thick black lines), blocked terrain (red lines), or spaces containing figures. See “Example of an Attack” below for a visual example.

LTP guide page 9:

When a large figure attacks, line of sight may be traced from any single space it occupies. When a large figure is attacked, the figure performing the attack can target any single space the large figure occupies.

As said before, there is no ark.

Thx guys,

That's what I thought. Just want to know it for sure.

It is basically assumed that even though a figure may be pointed a particular way, it is generally able to look in any direction before shooting.

Now the AT-ST does have a minimum range, so it cannot shoot adjacent enemies, but that you probably knew already.