The problem with conversion TOA Reflectance

[Igor]

Dear experts! How to obtain the values of the TOA Reflectance L1C data when more than QUANTIFICATION_VALUE? Give a reply please.

The QUANTIFICATION_VALUE has a true value (DN to TOA Reflectance)?

This is one single tile and has no background. Pay attention to the histogram. Most of the values for 10000. It really is such data and it is not only in this file. This is just an example, one of many.