Yep it's been a while, Earth...so I have asked the guys over at the Solar thread on some advice since I found Stereo A/B but not SOHO. Hopefully one of them can help...but it's probably trivial anyway, if that is linear then its signature would be quite large owing to a wide field and also the high reflectivity we'd expect of its ice crystals: both of which would add to its prominence even on Lasco...and, now I'm gonna duck.