FIGURE 1. The observed light curve of the OGLE-2005-BLG-390 microlensing event and best-fit model plotted as a function of time.
From the following article:
Discovery of a cool planet of 5.5 Earth masses through gravitational microlensing
J.-P. Beaulieu,
D. P. Bennett,
P. Fouqué,
A. Williams,
M. Dominik,
U. G. Jørgensen,
D. Kubas,
A. Cassan,
C. Coutures,
J. Greenhill,
K. Hill,
J. Menzies,
P. D. Sackett,
M. Albrow,
S. Brillant,
J. A. R. Caldwell,
J. J. Calitz,
K. H. Cook,
E. Corrales,
M. Desort,
S. Dieters,
D. Dominis,
J. Donatowicz,
M. Hoffman,
S. Kane,
J.-B. Marquette,
R. Martin,
P. Meintjes,
K. Pollard,
K. Sahu,
C. Vinter,
J. Wambsganss,
K. Woller,
K. Horne,
I. Steele,
D. M. Bramich,
M. Burgdorf,
C. Snodgrass,
M. Bode,
A. Udalski,
M. K. Szyma
ski,
M. Kubiak,
T. Wi
ckowski,
G. Pietrzyski,
I. Soszyski,
O. Szewczyk,
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B. Paczyski,
F. Abe,
I. A. Bond,
T. R. Britton,
A. C. Gilmore,
J. B. Hearnshaw,
Y. Itow,
K. Kamiya,
P. M. Kilmartin,
A. V. Korpela,
K. Masuda,
Y. Matsubara,
M. Motomura,
Y. Muraki,
S. Nakamura,
C. Okada,
K. Ohnishi,
N. J. Rattenbury,
T. Sako,
S. Sato,
M. Sasaki,
T. Sekiguchi,
D. J. Sullivan,
P. J. Tristram,
P. C. M. Yock
&
T. Yoshioka
Nature 439, 437-440(26 January 2006)
doi:10.1038/nature04441
Error bars are 1
. The data set consists of 650 data points from PLANET Danish (ESO La Silla, red points), PLANET Perth (blue), PLANET Canopus (Hobart, cyan), RoboNet Faulkes North (Hawaii, green), OGLE (Las Campanas, black), MOA (Mt John Observatory, brown). This photometric monitoring was done in the I band (with the exception of the Faulkes R-band data and the MOA custom red passband) and real-time data reduction was performed with the different OGLE, PLANET and MOA data reduction pipelines. Danish and Perth data were finally reduced by the image subtraction technique19 with the OGLE pipeline. The top left inset shows the OGLE light curve extending over the previous 4 years, whereas the top right one shows a zoom of the planetary deviation, covering a time interval of 1.5 days. The solid curve is the best binary lens model described in the text with q = 7.6 
0.7 
10-5, and a projected separation of d = 1.610 0.008RE. The dashed grey curve is the best binary source model that is rejected by the data, and the dashed orange line is the best single lens model.
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