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# Long description

This is a graph with a dimensionless vertical scale from 0 to 1, against height (km) from 0 to 20 km. 6 lines are shown. They all start from (0 km, 1) i.e. maximum value at the surface.

Straight line sloping down from the start to 0.85 at 11 km then horizontal for remaining heights. It is labelled c/c subscript 0 where c subscript 0 is 340 m per s.

The second line is sloping down to 0.8 at 11 km and labelled Greek letter eta/eta subscript 0, where eta subscript 0 is 18 x 10 to the power of -6 N s per m squared.

The third line is sloping down to 0.6 at 11 km and labelled T/T subscript 0, where T subscript 0 is 288.15 K.

The remaining 3 graphs are curves that continuously fall with decreasing slope to low values (around 0.1) at 20 km height. They are close together and the top and middle curves have slight kinks at height 11 km.

The top of these is Greek letter nu subscript 0/nu, where nu subscript 0 is 14.7 times 10 to the power of -6 m squared per s.

The middle one is Greek letter rho/rho subscript 0 where rho subscript 0 is 1.225 kg per m cubed.

The lower one is P/P subscript 0 where P subscript 0 is 101.3 kPa.