Normally the explorer only allows you to filter on the last day or a specified date.
However, if you want to run an exploration on the last X days, you can use the ALERT function.
for example, if your filter is C > MOV(C,200,S)
You could scan for this condition any time in the last 7 trading days with:
ALERT(C > MOV(C,200,S),7)
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