# Example 2.1 - a laboratory propagation path

f 0 GHz  2500 GHz  50 MHz    # frequency grid for computation
T0 77 K                      # background temperature

layer                        # introduces a layer
P 1013.25 mbar               # layer pressure
T 20 C                       # layer temperature
h 1 m                        # layer thickness
column h2o vmr 0.012         # adds a column of h2o to this layer