def open_vol(final_vol):
    """Converts the array of volumes with comp volumes to two lists of separate volumes"""
    number = len(final_vol[0])
    open_vol = []
    for i in range(number):
        string = 'comp' + str(i)
        string = []
        for row in final_vol:
            hold = row[i]
            string.append(hold)
        open_vol.append(string)
    return open_vol
