Dear Caspar, it works!!! Your command line made me realize that, in Unix or MacOSX, the environment variable PATH is only useful for telling the system where to look for *executables* but it's absolutely useless for helping the system find data files!!! I never realize that. So, I modified my command line this way: > dispread -v -yl -k$HOME/argyll/rb/eizo_x94.cal $HOME/argyll/rb/eizo And it works like a charm! Thank you so much, Roger Breton