how to shift rows to match each other

I have a 202x3 double of depths in meters in increments of 0.1m. for example...

 depths = [0.6,0.3,0.4; 0.7,0.4,0.5; 0.8,0.5,0.6; 0.9,0.6,0.7]

and so on until about 20m or so, each column being a different profile. I need help in shifting the rows so that the depths for each profile match. End result being...

depths = [nan,0.3,nan; nan,0.4,0.4; nan,0.5,0.5; 0.6,0.6,0.6]

I then need to by how much each profile shifted in order to apply the shifts to other matrices. Thank you.

[dpb]

I can't fathom how you got the result...