By ROY CUMMINGS
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TAMPA – We’ve done a little digging on those Marvin Harrison rumors and as we suspected there’s very little to them.

The Bucs call about Harrison is said to have been “exploratory,’’ which is a high-brow way of saying they probably did little more than ask how he was doing and what he was up to while talking to his agent about another client.

Keep in mind, though, that the Bucs calls about Plaxico Burress were said to be “exploratory’’ as well, yet Coach Raheem Morris sounded a lot last week like a guy who was very interested in adding Burress to his roster.

It’s hard to imagine the Bucs signing Harrison, though. They’ve already let go of two 30-something receivers in Joey Galloway and Ike Hilliard, so the idea of signing Harrison seems to run contrary to their thinking.

Once again, however, you have to give the Bucs credit. They’re leaving no stone unturned in an effort to boost their receiving corps, which clearly has some veteran depth issues.