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At some point I get this error:

Warning: scaled local spatial error estimate of 32773.0090044258` at 
t = 987.7919550194803` in the direction of independent variable x is much greater than the     
prescribed error tolerance. Grid spacing with 1001 points may be too large to achieve the  
desired accuracy or precision.   

(etc.)

How do I track this time with WhenEvent? How is this scaled local spatial error kept in NDSolve?

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