1 ... 7 (which data of the bar) : 1 for date, 2 for time, 3 for open, 4 for high, 5
for low, 6 for close, 7 for volume
rowgridoffset : 0 for the first chart, 0+7=7 for the second chart, 7+7=14 for the
third chart, etc. (increment by 7 from 0)
bar_number : 1 is the first bar (with the oldest date time) from the left to the
right