I'm studying 2 Kings 2 and came across something interesting in v14:
He took the cloaks that had fallen from Elijah and struckt the water with it. “Where now is the LORD, the God of Elijah?” he asked. When he struck the water, it divided to the right and to the left, and he crossed over.
The New International Version (Grand Rapids, MI: Zondervan, 2011), 2 Ki 2:14.
In some LXX texts the words καὶ οὐ διέστη (and they were not separated) are inserted after the first mention of Elisha striking the water but in some texts these words are absent. So it is in Rahifs' text (Logos LXX) but not in Swete's (LXX Swete)

How would I use Logos to go about determining which is a "better" reading, whatever that means?
Thanks, Graham