 Each experiment modified a distinct simulation property, namely  the level of immersion, the level of personalization, and the level of behavioral realism.
<fluency>  Each experiment modified a distinct simulation property, namely  the level of immersion, the level of personalization, and the level of behavioral realism.
 Each experiment modified a distinct simulation property, namely , the level of immersion, the level of personalization, and the level of behavioral realism.