chds = 0,1800
https://image-charts.com/chart?chd=a%3A2060%2C971%2C849&chds=0,1800&chs=700x100&cht=bvg
chds = 0,2000
https://image-charts.com/chart?chd=a%3A2060%2C971%2C849&chds=0,2000&chs=700x100&cht=bvg
So chds = 0,1800
has a lower bar than chds = 0,2000
when I expect the opposite. With chds = 0,1800
I expect the bar to take up the whole image since 2060 is more than 1800.
Docs: https://documentation.image-charts.com/reference/chart-axis/