Tanvir Ahmed, thanks for the review. Just to let you know that Distance 6 is an old version of the software. We have now released (and recommend using) Distance 7.1 which has multiple bug fixes and new features. It can be downloaded from our Distance Sampling website distancesampling.org . Downloading from our website also lets us keep a record of our users which is useful when we apply for more funding to continue developing the software!
Tanvir Ahmed
