In the background of this BGAN there are 6-8 vertical columns, with a slight dark to light transition within them. These are mostly 3 pixels wide, although column 3 and 4 from the left almost seem to merge.
(Perhaps this could be considered the higher ranked Gradient type, however I think it lacks an obvious macro transition, and there is a clearer line down the center)
I think this background best matches the description of 'Verticals' from the Trait Constitution:
1.4.32 VERTICALS
https://opensea.io/assets/ethereum/0x31385d3520bced94f77aae104b406994d8f2168c/2825