(Bloomberg) -- The euro may decline to a 10-week low against the yen after falling below so-called support at 126.42, said Tsutomu Soma, a bond and currency dealer at Okasan Securities Co., citing trading patterns.

Support at 126.42 yen represents the neckline of a so- called “head-and-shoulders” pattern, which was completed when the euro closed at 126.14 yen yesterday, Tokyo-based Soma said. A head and shoulders is formed when a currency makes three consecutive peaks, with the middle being the highest. The neckline is drawn across the base of the three peaks.

“The euro-yen has broken below the neckline of the head and shoulders, which means it’ll probably go down more,” Soma said. “The target is around 115.38 yen.”

Europe’s single currency dropped to 124.59 yen as of 7:39 a.m. in London from 126.14 yen in New York yesterday. It earlier reached 124.54 yen, the lowest level since March 12. The 115.38 yen level was last seen on Feb. 12, according to data compiled by Bloomberg.

In technical analysis, investors and analysts study charts of trading patterns and prices to forecast changes in a security, commodity, currency or index. Support is a level where buy orders may be clustered and resistance is where there may be sell orders.

To contact the reporter on this story: Ron Harui in Singapore at rharui@bloomberg.net.