aligning figures in figured bass horizontally

[Leszek Wroński]

Hello Experts,

if there's a c2 in the bc voice and the figures are "<7>4 <6>", the '7' ends up higher than the '6':

https://www.dropbox.com/s/f45idpgtnd1jjch/figured_bass.png

(I'm using 2.20.)

Is there a method of telling Lilypond to align the figures horizontally in the space of, say, a measure? 

Thank you very much in advance!

Best regards,

Leszek.