Reproduction of the composite samples of BA15, showing the monthly-resolution pressure-adjusted neutron monitor count rate (units: counts min⁻¹ × 10³) from Oulu station (65.05° N, 25.47° E, 0.8 GV) occurring during 12 years of Indian monsoon “Drought” (D) and “Flood” (F) conditions. Composite means (in the matrix m-dimension) are plotted, with error ranges shown as ±1 standard error of the mean (SEM) value. The period of May–September, selected by BA15 for Pearson’s correlation analysis, has been emphasised in the plots.