================================================================================
   Microlensing optical depth and event rate toward the Large Magellanic Cloud
                     based on 20 years of OGLE observations

 P. Mroz, A. Udalski, M. K. Szymanski, M. Kapusta, I. Soszynski, L. Wyrzykowski,
 P. Pietrukowicz, S. Kozlowski, R. Poleski, J. Skowron, D. Skowron, K. Ulaczyk,
         M. Gromadzki, K. Rybicki, P. Iwanek, M. Wrona, and M. Ratajczak


                   No massive black holes in the Milky Way halo

      P. Mroz, A. Udalski, M. K. Szymanski, I. Soszynski, L. Wyrzykowski,
 P. Pietrukowicz, S. Kozlowski, R. Poleski, J. Skowron, D. Skowron, K. Ulaczyk,
         M. Gromadzki, K. Rybicki, P. Iwanek, M. Wrona, and M. Ratajczak

================================================================================

pmroz@astrouw.edu.pl

The directory structure is as follows:

README            - this file

limits.txt        - 95% upper limits on compact objects as constituents of dark
                    matter

table1.txt        - electronic version of Table 1 (OGLE-IV Fields Toward the
                    Large Magellanic Cloud)
                    
table2.txt        - electronic version of Table 2 (Median Difference Between
                    the New OGLE-III and OGLE-IV Magnitudes)

table3.txt        - electronic version of Table 3 (Error Bar Correction
                    Coefficients for the I-band Data)
                    
table5.txt        - electronic version of Table 5 (Detected Microlensing Events)

table7.dat        - electronic version of Table 7 (Number of Microlensing Source
                    Stars Observed in OGLE-IV Fields)

phot/             - calibrated I-band photometry of individual events
phot.tar.gz       - gzipped phot/ directory

eff_o3_o4/        - event detection efficiencies in individual fields observed
                    by OGLE-III and OGLE-IV
eff_o3_o4.tar.gz  - gzipped eff_o3_o4/ directory

eff_o4/           - event detection efficiencies in individual fields observed
                    by OGLE-IV only
eff_o4.tar.gz     - gzipped eff_o4/ directory

Format of the photometry files:
------------------------------------------------------------------------
 Bytes  Format Units   Description
------------------------------------------------------------------------
  1- 13 F13.5  HJD     Heliocentric Julian Date
 15- 20 F6.3   mag     I magnitude
 22- 26 F5.3   mag     Magnitude error
------------------------------------------------------------------------

The I-band photometry is calibrated to the standard system. The uncertainties 
were corrected as described in Section 2.3.

Format of the detection efficiency files:
------------------------------------------------------------------------
 Bytes  Format Units   Description
------------------------------------------------------------------------
  1-  4 F4.2   ---     Minimal log(t_E)
  6-  9 F4.2   ---     Maximal log(t_E)
 11- 18 F8.6   ---     Detection efficiency
------------------------------------------------------------------------