SP score in muscle: What exactly does it mean, and is higher or lower a 'better' score of alignment?

Question

[Tom]

Hi all,

I have two similar-ish alignments. I found an SP-score for both. One is slightly higher than the other. I am confused as to whether I should take the higher, or lower score as a 'better' alignment. I read there are linked to PAM250 scores?

Could someone explain what the difference is?

Thanks