! Columbus supports keywords that allow you to define distance PPM errors. Once a PPM error has 
! been defined, it will apply to all applicable observations that follow in the file. You can 
! turn off the PPM setting at any time by setting it back to zero.



! Example:

! Establish PPM errors for Chord Distance observations that follow in the file.
!            PPM (Parts Per Million)
_PPM_CHORD;  7.0

! Define some observations with chord distances
_OBS_AZ_SET;  A; D; 0.0; 0.001; 93.0; 25.0; 106.25; 0.05; 0; 0
_OBS_DIR_SET; FALLS; MINERS; 322.2940; 3.0; NOOBS; NOOBS; 1000.5; 0.0055; 1.5; 1.2; 1
_OBS_HA_SET;  A; B; D; 90.0000; 20.0; 88.0000; 25.0; 93.7500; 0.050; 0; 0
_OBS_CHORD; 101; 102; 3780.260; 0.025; 0; 0

! Now, turn Chord Distance PPM off or change it to another value for chord observations that follow.
_PPM_CHORD;  0





! Establish PPM errors for Chord Distance observations that follow in the file.
!            PPM (Parts Per Million)
_PPM_CHORD;  7.0




! Establish PPM errors for Horizontal Distance observations that follow in the file.
!              PPM (Parts Per Million)
_PPM_HOR_DIST; 8.5




! Establish PPM errors for Height Difference observations that follow in the file.
!              PPM (Parts Per Million)
_PPM_HGTDIFF;  3.2