SetScrollView and scatter chart

[User (Legacy)]

Hi! 

I have a scatter chart with X values changing from -20.0 to +20.0. 

I want to make a 3-page display, i.e. 

page #1 - range -20 ... -6.67 

page #2 - range -6.67 ... +6.67 

page #3 - range +6.67 ... +20 

So I call SetScrollView(-20, -6.67) 

However the chart displays the range -20 ... -8 

If I call say SetScrollView(-20, -7) or SetScrollView(-20, -5) the display 

is correct 

but if the range is not an integer, the display is not correct. 

What am I doing wrong? 

Thanks, 

Serge