good work plotting the ratings, it is a very welcome addition to this community :)

some suggestions for the next version of the chart: (- inverting Drtg axis was already suggested before)

• same scaling of axes, so that 5 points of rating is visually the same length for Ortg and Drtg
• adding some diagonal lines to mark levels of the same net rating
• equalizing logo size, right now some are huge and some are tiny
• in some cases logo background could be transparent