RealSense F455 data output and working principle

[KatieCoco]

Hi,

I found that the F455 module can't output raw IR frames and depth frames via SDK 2.0. But I found the RGB images from one of the camera can be streamed. I have the following questions:

1. Is this module working off two IR images with speckle frames and LED flood frames? If so, why there is the RGB otuput?

2. Can I get IR frames and depth frames output in any way?

3. If the answer is no, which is the closest RealSense model to this F455 in terms of performance in IR image and depth image?