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Summary ���������ֳ� affirms the íAAí ratings on Otter Tail Power Co.ís (OTP) $104.1 million first mort-gage bonds and $42.9 million secured pollution control bonds. The $38.8 million preferred stock is lowered to íAAñí from íAAí, reflecting the comparatively high per-centage of preferred stock in the capital structure, an amount OTP...