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The Slavonian grebe, one of Scotland's most mysterious birds, has been in decline in recent years, with breeding pairs falling from about 80 at their peak during the 1970s and 1980s to just 22 today, ...

Some precalculated tables or empirical formulas are presented in this paper for correcting the observed reading afforded by conventional method., 本文提出一种方法，利用一张预先由计算给出的表格或经验公式对观测值进行校正。