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Among 24 of the largest San Gabriel Valley-based companies traded on the New York and American stock exchanges and NASDAQ, 13 gained value, nine lost and two remained unchanged Tuesday compared with the same day last week. Here’s how six fared over the past week.

Tue. Point Company Price Change GAINERS Tetra Tech Inc. $20.00 +1 1/4 International Aluminum 26.50 +1 Wesco Financial Corp. 122.75 + 3/4 LOSERS Ameron Inc. 35.75 - 1/2 Southern Calif. Water 17.75 - 5/8 Southern Calif. Edison 13.38 - 5/8

Source: Joe Lamas of Merrill Lynch, Pierce, Fenner & Smith Inc., Pasadena