How big of a slice? About this big?

SELECT * FROM gallery2 WHERE topic_id="571098" UNION SELECT * FROM gallery2 WHERE topic_id="1506377" UNION SELECT * FROM gallery2 WHERE topic_id="446744" UNION SELECT * FROM gallery2 WHERE topic_id="29167" UNION SELECT * FROM gallery2 WHERE topic_id="1526766" UNION SELECT * FROM gallery2 WHERE topic_id="1685496" UNION SELECT * FROM gallery2 WHERE topic_id="1770734" UNION SELECT * FROM gallery2 WHERE topic_id="470277" UNION SELECT * FROM gallery2 WHERE topic_id="1457613" UNION SELECT * FROM gallery2 WHERE topic_id="500136" UNION SELECT * FROM gallery2 WHERE topic_id="114198" UNION SELECT * FROM gallery2 WHERE topic_id="65354" UNION SELECT * FROM gallery2 WHERE topic_id="444845" UNION SELECT * FROM gallery2 WHERE topic_id="1495814" UNION SELECT * FROM gallery2 WHERE topic_id="503914" UNION SELECT * FROM gallery2 WHERE topic_id="974603"