Echo

sample avg 3.4

sample avg 3.2

sample avg 3.1

sample avg 4.0

sample avg 3.9

sample avg 3.0

sample avg 3.2

sample avg 3.7

sample avg 3.3

sample avg 3.5

sample avg 3.1

sample avg 3.8

sample avg 4.0

sample avg 3.0

sample avg 3.9

sample avg 3.5

sample avg 3.8

sample avg 3.5

sample avg 3.9

sample avg 3.2

sample avg 3.5

sample avg 3.6

sample avg 4.0