I added the following three characters to PT Serif (Regular, Italic, Bold, BoldItalic) and PT Sans-Regular (Regular, Italic, Bold, BoldItalic, Narrow, NarrowBold):COMBINING MACRON, COMBINING MACRON BELOW, COMBINING DOT BELOW. I made binding of these diacritical symbols to each Cyrillic sign for correct display relative to the central axis of the sign.