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\centerline{Blackbody target calibration coefficients : NOAA-7}


$$T_i = \sum_{j=0}^4  a_{ij}  \left( \overline{X}_i \right)^j
  \quad ; i=1,2,3,4 \hbox{  for PRTi,\quad  $T_i$  in degrees Kelvin}$$


$$\vbox{\offinterlineskip\hrule
\halign{&\vrule#&\strut\quad\hfil \tt #\hfil\quad\cr
height12pt depth 4pt&PRTi  && $a_{i0}$ &&  $a_{i1}$ &&  $a_{i2}$&&$a_{i3}$&& $a_{i4}$&\cr
\noalign{\hrule}
height12pt&$i=1$&&277.099&&5.048E-02&&2.823E-06&&0&& 0&\cr
&$i=2$&&276.734&&5.069E-02&&2.493E-06&&0&& 0&\cr
&$i=3$&&276.876&&5.148E-02&& 1.040E-06&& 0&&0&\cr
depth 4pt&$i=4$&&276.160&&5.128E-02&& 1.414E-06&&0&& 0&\cr
}\hrule}$$

\centerline{N.B. values differ slightly from satellite to satellite.}



\centerline{$\overline{T}  = \sum   b_i T_i$ 
;  usually $b_i$ = 0.25.}


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\centerline{Table 1 : PRT calibration coefficients.}


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