Inquiry about the definition of small-cap firms for "Small-Cap Insight"

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Dear Sir / Madam,

I am writing for your kind help on the definition of small-cap firms for "Small-Cap Insight". I notice there used to be a "Small-Cap Insight" category and I was wondering what is the cap threshold for small-cap firms for this column. Will articles on micro-cap firms also be included? 

Thank you so much for your time reviewing this email! 

Looking forward to your reply! 

Best Regards,

Pu