https://www.proz.com/personal-glossaries/entry/18159274-mid-point-concentration-of-the-standard-curve-%D0%BA%D0%BE%D0%BD%D1%86%D0%B5%D0%BD%D1%82%D1%80%D0%B0%D1%86%D0%B8%D1%8F-%D0%B2-%D1%81%D1%80%D0%B5%D0%B4%D0%BD%D0%B5%D0%B9-%D1%82%D0%BE%D1%87%D0%BA%D0%B5-%D0%B3%D1%80%D0%B0%D0%B4%D1%83%D0%B8%D1%80%D0%BE%D0%B2%D0%BE%D1%87%D0%BD%D0%BE%D0%B9-%D0%BA%D1%80%D0%B8%D0%B2%D0%BE%D0%B9