In TCGA Copy number variation (CNV) data there is a column with title Num_Probes. What is the meaning of probe number with respect to the sample data below?
Chromosome Start End Num_Probes Segment_Mean 1 61735 62152 4 1.1973 1 62920 12777697 6514 2.2882
According to wikipedia, probes are usually 100-1000 bases long. Then does it mean in the first row above that, it took 4 probes to identify the region(61735 - 62152). In that case what would be the meaning of Segment_Mean?