Centroid and Median cluster?

I am utilizing the DynamicBC k-means clustering algorithm and have encountered a file called the "Centroid", which is matrix that exhibits smaller values in comparison to the Median cluster. I am interested in understanding the underlying reasons for this discrepancy and determining which of these metraces, Centroid or Median cluster, is more appropriate for my analysis. Additionally, I would appreciate an explanation of the concept of "pCentroid" as well, which is in the same directory as the Centroid.