Figure 1
The map shows China divided into multiple administrative regions, each filled with a color corresponding to numeric ranges indicated in the legend on the upper right. The legend is described color wise as follows: the value “0” is represented by light blue, the range “0 to 0.02” is represented by purplish blue, the range “0.02 to 0.04” is represented by pink, the range “0.04 to 0.06” is represented by grey, the range “0.06 to 0.10” is represented by slightly darker blue, the range “0.10 to 0.20” is represented by green, the range “0.20 to 0.30” is represented by orange, the range “0.30 to 0.70” is represented by yellow, the range “0.70 to 2” is represented by purple, and values greater than “2” are represented by red. Large portions of western and northern China appear in light blue and purplish blue, indicating lower values, central regions display mixed colors, including pink, grey, and slightly darker blue, and eastern and southeastern regions contain clusters of green, orange, yellow, purple, and red, indicating higher values. Clear boundary lines separate each region, and southern island areas follow the same color-based classification.The geographical distribution of clan culture across China. Note: Clan culture is measured by the number of genealogies per 10,000 residents in each city. The map illustrates the geographic distribution of clan culture across China, with a stronger presence in the southeast and weaker presence in the north and west. The color scale in the upper right corner indicates the density of genealogies