He around dhps from multiple periods across Brazil.
The figure shows variation in He surrounding dhps during the 1980s and 1990s. It appears that He has increased between the 1980s (n = 21) and 1990s (n = 126) for the triple mutant. The double mutant (n = 7) seems to have a similar shape as the triple mutants. The two flat, dashed lines represent two different estimates of neutral He in Brazil.