Line spacing with sub- and superscripts

I have various books with subscripts or superscripts in them and I am trying to convert them via Calibre from RTF to LRF format. The output file always increases the line height in the lines where these codes are and I wondered if it was possible to change something so that the line space was the same throughout. I have attached a small RTF file I have set up to test this and the output LRF file.

Attached Files

	1a Test of formatting - 1a Anon.rtf (79.6 KB)
	1a Test of formatting - 1a Anon.lrf (2.2 KB)