Contains binned Level-2 Sulfur Dioxide (SO2) vertical column products using COvariance-Based Retrieval Algorithm (COBRA) retrievals. The L3 binning algorithm weighs individual pixels with the overlap area of the pixel and the Level-3 grid cell. The weighing and count vectors are used to apply this weighted average consistently, see http://stcorp.github.io/harp/doc/html/libharp_product.html?