Change atop log interval from 10 minutes to 1 minute

I'm having post-mortem atop log on Ubuntu machine, which I'm able to view with atop -r The problem is that log files are shown in 10 minute intervals with t and Shift+t, while I would prefer 1 minute intervals. When current time is changed with b, it is quantized to nearest 10 minute point. I have a line in /etc/init.d/atop, but I'm not sure if it affects anything here: INTERVAL=60 How can I make atop logs to be browsed with 1 minute accuracy with t and Shift+t? Is the information between these 10 minute intervals already lost? What are the possible workarounds if this is not possible?