Interstellar Extinction toward the Galactic Bulge from OGLE-III data
Coordinates may be entered as DD.DDDDD, DD:MM:SS.SS or (in single query only)
DD MM SS.SS Right Ascension always in hours.
Uploaded file should have coordinates in columns 1 and 2 and
may begin with special line starting with '#' followed by any of tokens:
for RA/Dec or galactic l/b coordinates (default: RD)
NG NN for algorithm, see below (default: NG)
GOOD ALL to use good (QF=0) or all data points (default: GOOD)
- nearest grid point (NG) : finds values at the nearest sky point
from Table3 of Nataf
et al. paper.
- natural neighbor interpolation (NN) : value interpolated from Table3 data
using Python matplotlib.mlab module
Requests outside covered area result in values of -9.999. Only the grid
points within 600 arcsecs are considered.
The interpolation requires the requested coords to lie inside the
convex hull of the grid points used for calculations.
Last column always gives the distance to the nearest grid point.
Raw data used by this Calculator and description of columns are available
As of May 31, 2013, new, denser grid is available, see
The values of R_JKVI=E(J-Ks)/E(V-I) shown by this calculator primarily
assume the E(J-Ks) measurements of Gonzalez et al. (2012). If you use these
measurements as well, you should cite Gonzalez et al. (2012,
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