Hi
sorting order is defined by volume sorts selections by matched volume in ascending order, lowest first highest last
match_index is the index of matching selections in the sorted list above
matching_number is the total number of selections that match previous conditions
so match_index of first in the list (lowest volume in this example) is 1
second highest traded volume is second last selection in the list as sorted above (matching_number -1)
yes third most traded match_index = matching_number -2