Need to clean a table, and compute mean and SD

Hi

For a school project I have a file with 120 columns and  ~2000 lines. This
file contains timestamps of spike detected in 60 channels, and the time
elapsed between the last spike.

I need to clean too high values. About 98% of values are between 0 and 2000
and 2% are between 2000 and 20'000. I want to get rid of theses values.

Please could you help me?

Regards 

Thom

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