I suspect that maybe the rise time was much slower than the fall time, so it was the fall time they were excited about. But yeah, I'd think a 630-attosecond fa

I suspect that maybe the rise time was much slower than the fall time, so it was the fall time they were excited about. But yeah, I'd think a 630-attosecond fall time represents 500–800 terahertz of bandwidth, not a petahertz or more.