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spec: For each gridded irradiance datum , a formal error is computed accounting for both dark and light signals . The Sunquists are a mature couple who can travel freely into the past , refreshing their marriage at its points of origin and greatest affection ; but past truths may not accord with fond memories ; and stepping into the future can be fatal , as the essence of one 's dotage prematurely appears . Within days volunteers began appearing at Rahim 's door.And this time , says Rahim , the solidarity that defused rising racial tensions was white . Although this document is meant to inspire rather than dictate action , its adoption by UNESCO will be an important opportunity to raise digital preservation issues with governments and others who can influence how laws , budgets , and expectations are framed to help or hinder continuity of the digital heritage . These don ' t have to be classes themselves , nor do they necessarily have to have ancestor or descendant relationships with other entities in your system . Even now it seems incredible , but the spell that ' The Sultan 's Elephant ' cast on those who saw it meant that for those few precious hours , everyone involved felt a sense of kinship and connectedness .