ReadMe File
                              26 February 1999

You have downloaded a gzipped, tar file containing data from the PLANET 
Collaboration paper entitled:

                   The Relative Lens-Source Proper Motion 
                              in MACHO 98-SMC-1  
    
         M. Albrow, J.-P. Beaulieu, J.A.R. Caldwell, D.L. DePoy, 
         M. Dominik, B.S. Gaudi, A. Gould, J. Greenhill, K. Hill, 
         S. Kane, R. Martin, J. Menzies, R.M. Naber, K. Pollard, 
       P.D. Sackett, K.C. Sahu, P. Vermaak, R. Watson, A. Williams

                         (The PLANET Collaboration) 
                                     and
			         R. W. Pogge

This paper is published in the Astrophysical Journal, 1999, 512, 672, 
and is also available through the electronic archives at 
http://babbage.sissa.it/abs/astro-ph/9807086.  Please reference 
this article if you make use of these data.

The data set has been REVISED relative to the version used in the above
paper.  The SAAO data have been re-reduced using a better template and 27
late-time data points (1001<HJD<1027) have been added.  All times are now
HJD at the midpoint of the exposure.  The new version is described and used
in the PLANET Collaboration paper entitled: 

			Solutions For Caustic-Crossing Binary 
				Microlensing Events

      M. Albrow, J.-P. Beaulieu, J.A.R. Caldwell, D.L. DePoy, M. Dominik, 
       B.S. Gaudi, A. Gould, J. Greenhill, K. Hill, S. Kane, R. Martin, 
         J. Menzies, R.M. Naber, K. Pollard, R.W. Pogge, P.D. Sackett, 
                K.C. Sahu, P. Vermaak, R. Watson, A. Williams

                         (The PLANET Collaboration) 

This paper has been submitted for publication in the Astrophysical Journal 
and is also available through the electronic archives at 
http://babbage.sissa.it/abs/astro-ph/9903008.  Please reference this
article also. 


In addition to this ReadMe file, the tar file consists of 1 ascii data file.  
The data file contains the PLANET collaboration light curve for the 
SMC microlensing event MACHO 98-SMC-1, and is arranged as follows:

col1    timestamp       HJD - 2450000.0
col2    site            Observing site where data were taken
                        1 = Sutherland  (SAAO 1m)             
                        2 = Yale/CTIO   (Yale 1.0m)           
                        3 = CTIO        (CTIO 0.9m)           
                        4 = Tasmania    (Canopus Observatory 1.0m)
col3    I magnitude     Cousins I 
col4    error           Uncertainty in magnitudes

These are magnitudes are calibrated to the Cousins system using OGLE data
(See Albrow et al. 1999 ApJ 512).

For more information about this event, refer to the PLANET article above.