Enrichment histories of target gas particles in the inner (purple, left column) and outer (orange, right column) rings. Three chemical abundances with different dominant stellar progenitors are shown: [Fe/H], [O/H], and [N/H] (top, middle, and bottom rows, respectively). For each ring, the background map illustrates the individual evolution of gas particles, while the solid line indicates the median abundance and the shaded regions correspond to the 25th and 75th percentiles. The right panels show violin plots of the [X/H] distributions with overlaid box plots indicating the median and interquartile range.