The default extension for the name of a Fresnel-coverage file is .frs.
[header] [rest fresnel] <end>
The type of the file must be fresnel.
{ <environment> $int$:32 } { <zone> $int$:16 } [transmitter] [receiver] [fresnel values]
The environment value represents the check sum of the environment file for which the fresnel file has been computed.
[fresnel value] | [fresnel values]
<TRANSMITTER> <INDEX> $int$:32 <RECEIVER> <INDEX> $int$:32 <FRESNEL> $float$:32
The fresnel value indicates the percentage of clearance of the fresnel zone between the receiver and transmitter point.