A second identical set of test
papers was prepared exactly as the first set, and these
5 papers were shown in a random array to the same
physicians within 10 minutes of the addition of hydrochloric
acid, providing a total of 3 sets of 5 readings
for each volunteer, for a total of 15 readings for each
different amount of a-amanitin. Each observer was
shown the papers without any input from the other observers.