Total Phosphorus (mg/L) Tot a I Nitrogen (mg/L) as ND2 & N03 
An Ecological Assessment of the Louisiana Tensas River Basin Chapter 4 
Figure 4.2 Total nitrogen and phosphorus concentrations for three Louisiana state water quality monitoring stations in 
the Tensas River Basin. Data displayed are from those samples collected 1990- 1996. The top and bottom edges 
of the light blue box represent the 25th and 75th percentiles of the distribution of the data (i.e., 50% of the data values 
fall within this range). The horizontal line drawn within the blue box represents the median value. The vertical 
lines extend to the 10th and 90th percentile. Any value outside of this range is displayed on the graph as a light 
blue dot. The number of data points included in the analysis is printed above each box. 
