Dear Alfonso,

Many thanks for your prompt reply! The reason for the different cluster sizes absolutely makes sense and I can understand why going from one-sided positive to two-sided would not change the peak coordinates of these clusters. What concerns me is the discrepancy between the positive and negative aspects: i.e., the peak coordinates for one-sided positive and two-sided results are the same, but the peak coordinates for one-sided negative and two-sided are different. In my attachment, I have screenshots of the two-sided result (p-height: .001), positive one-sided (p-height: .0005), and negative one-sided (p-height: .0005). The little red arrows in the coordinate box of the two-sided screenshot indicates positive results. If you compare the coordinates next to these arrows with the coordinates from the one-sided positive coordinates, you will notice that they are identical. Meanwhile, if you compare the coordinates from the two-sided results that are not accompanied by an arrow with the one-sided negative coordinates, you will notice that every coordinate is different.

Many thanks,
Teddy