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Grid map
Particles m⁻³ pooled over a lat/lon grid: each tow is spread along its track and every cell it crosses receives its share of particles and volume (Σ particles ÷ Σ volume per cell).
Counting: Melt-test positive (the lab tracker's basis); net samples only. 0 of 0 events have coordinates and a volume; each tow is sampled at 24 points along its track and shared out over the cells it crosses. Click a cell for its events; toggle the tracks in the layer control. Download the plot as PNG from the camera icon in the chart toolbar.
Nothing to plot for these filters.