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I'll second the self leveling. Works quite well, gets very smooth, but it has to be level, since it will utilize gravity, and will be level, even if your floor isn't. If your floor is level, you are probably looking at 1 bag to fill that space.

Another option would be non shrink grout. It is quite hard, and can be troweled, but the level is up to you.

Normal mortar would work, but isn't designed for that type of application. It would likely shrink and give you cracks. It is designed for joints in masonry, and shouldn't be utilized as a flat surface, although some do so.
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