diff --git a/Data/EXAMPLE_OBSDATA/example_SED_1b.xcat b/Data/EXAMPLE_OBSDATA/example_SED_1b.xcat
new file mode 100644
index 0000000..b884692
--- /dev/null
+++ b/Data/EXAMPLE_OBSDATA/example_SED_1b.xcat
@@ -0,0 +1,45 @@
+\DustemWrap SED
+\Comment lines start with \
+\Undefined/missing value is -32768.0
+\An example SED in .xcat format for illustrating how to use DustEMWrap 
+\The wavelengths are disordered on purpose, to show that the ordering of the input data does not affect the fitting
+\=====================================================
+\instru: Instrument name [for user convenience]
+\filter: Instrument filter
+\wave: Filter reference wavelength [micron, for user convenience]
+\StokesI: SED intensity [MJy/sr]
+\StokesQ: Q Stokes parameter intensity [MJy/sr]
+\StokesU: U Stokes parameter intensity [MJy/sr]
+\largeP: Polarized intensity P [MJy/sr, for user convenience]
+\smallp: polarization fraction [0.01 = 1%, for user convenience]
+\psi: polarization angle [deg, for user convenience]
+\sigmaII: variance on Stokes I [(MJy/sr)^2]
+\sigmaQQ: variance on Stokes Q [(MJy/sr)^2]
+\sigmaUU: variance on Stokes U [(MJy/sr)^2]
+\sigmaIQ: covariance on Stokes I and Q [(MJy/sr)^2]
+\sigmaIU: covariance on Stokes I and U [(MJy/sr)^2]
+\sigmaQU: covariance on Stokes Q and U [(MJy/sr)^2]
+\sigma_largep: variance on Polarized Intensity (P) [(MJy/sr)^2, for user convenience]
+\sigma_smallp: variance on polarisation fraction (p) [for user convenience]
+\sigma_psi: variance on polarisation fraction (psi) [deg^2, for user convenience]
+\=====================================================
+|INSTRU |FILTER |WAVE    |STOKESI    |STOKESQ  |STOKESU  |LARGEP   |SMALLP   |PSI      |SIGMAII     |SIGMAQQ  |SIGMAUU  |SIGMAIQ  |SIGMAIU  |SIGMAQU  |SIGMA_LARGEP |SIGMA_SMALLP |SIGMA_PSI |
+|char   |char   |real    |real       |real     |real     |real     |real     |real     |real        |real     |real     |real     |real     |real     |real         |real         |real      |
+|NULL   |NULL   |NULL    |NULL       |NULL     |NULL     |NULL     |NULL     |NULL     |NULL        |NULL     |NULL     |NULL     |NULL     |NULL     |NULL         |NULL         |NULL      |
+SPIRE   SPIRE1  250.0    1.8         -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  2.90004e-02  -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  -32768.0      -32768.0      -32768.0
+SPIRE   SPIRE2  350.0    0.9         -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  2.90004e-02  -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  -32768.0      -32768.0      -32768.0
+SPIRE   SPIRE3  500      0.4         -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  5.90004e-03  -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  -32768.0      -32768.0      -32768.0
+NIKA    NIKA21  1200     0.15        -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  1.90004e-03  -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  -32768.0      -32768.0      -32768.0
+NIKA    NIKA22  2000     0.2         -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  5.10004e-04  -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  -32768.0      -32768.0      -32768.0
+IRAC    IRAC1   3.60000  0.00130775  -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  7.90004e-08  -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  -32768.0      -32768.0      -32768.0   
+IRAC    IRAC2   4.50000  0.00123874  -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  4.18501e-08  -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  -32768.0      -32768.0      -32768.0   
+IRAC    IRAC4   8.00000  0.0504011   -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  7.57350e-06  -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  -32768.0      -32768.0      -32768.0   
+IRAS    IRAS1   12.0000  0.0344639   -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  3.87873e-06  -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  -32768.0      -32768.0      -32768.0   
+MIPS    MIPS1   24.0000  0.0373517   -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  8.64360e-06  -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  -32768.0      -32768.0      -32768.0   
+IRAS    IRAS3   60.0000  0.732637    -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  0.00243502   -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  -32768.0      -32768.0      -32768.0   
+IRAS    IRAS2   25.0000  0.0557090   -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  3.15081e-05  -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  -32768.0      -32768.0      -32768.0   
+MIPS    MIPS2   70.0000  0.861524    -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  0.00355327   -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  -32768.0      -32768.0      -32768.0   
+IRAS    IRAS4   100.000  1.46069     -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  0.00677211   -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  -32768.0      -32768.0      -32768.0   
+MIPS    MIPS3   160.000  2.12215     -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  0.0104897    -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  -32768.0      -32768.0      -32768.0   
+IRAC    IRAC3   5.80000  0.0154945   -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  7.54617e-07  -32768.0  -32768.0  -32768.0  -32768.0  -32768.0  -32768.0      -32768.0      -32768.0   
+\=====================================================
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