To visualize the timespan of 800-1000 years on the x-axis in the "wcoherence" plot, you can adjust the sampling interval "Ts." The sampling interval "Ts" specifies the duration between two consecutive points in the data. In this case, it is set to "0.74 years." Consequently, the timespan on the x-axis will scale to "length(data) × 0.74," which might result in a 0-400 range on the x-axis in the visualization.
For more details on how "Ts" affects the plot, you can refer to the MathWorks documentation provided here:
