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[交流] 【求助】cif B类错误

PLAT242_ALERT_2_B Check Low       Ueq as Compared to Neighbors for         C6  
解释;The U(eq) value of an atom is compared with the average U(eq) for
non-hydrogen atoms bonded to it. Large differences may indicate that the
wrong atom type was assigned (e.g. N instead of O). False alarms may
occur for terminal groups such as the t-butyl moiety.

   
PLAT031_ALERT_4_B Refined Extinction Parameter within Range ......       1.57 Sigma
解释:This test checks whether a refined extinction parameter is meaningful
i.e. whether its value is significantly larger than its corresponding s.u.
If not, this parameter should be removed from the model and the structure
refined without this meaningless additional parameter.
The current default gives a warning when its value is within 3.33 s.u.
SHELXL97-2 will not allow negative values leading to ill-convergence and
non-zero maximum shift/error values: remove extinction parameter from the
refinement.
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