diff --git a/lab_3/data/diode.dat b/lab_3/data/diode.dat
new file mode 100644
index 0000000..f5bb925
--- /dev/null
+++ b/lab_3/data/diode.dat
@@ -0,0 +1,11 @@
+# Temperature (C) Diode Value
+68  364
+67  367
+58  382
+52  390
+49  396
+43  405
+42  408
+37  415
+33  422
+25  438
diff --git a/lab_3/data/diode.gplot b/lab_3/data/diode.gplot
new file mode 100644
index 0000000..6e49d3d
--- /dev/null
+++ b/lab_3/data/diode.gplot
@@ -0,0 +1,13 @@
+set key off
+set xlabel 'Temperature (°C)'
+set ylabel 'ADC Value'
+
+f(x) = a*x +b
+
+fit f(x) 'diode.dat' using 1:2 via a, b
+
+set term pngcairo
+set output 'diode.png'
+
+p f(x) lt rgb "black" dt 2, \
+    'diode.dat' using 1:2 lc rgb "black"
diff --git a/lab_3/data/diode.png b/lab_3/data/diode.png
new file mode 100644
index 0000000..6e77109
Binary files /dev/null and b/lab_3/data/diode.png differ
diff --git a/lab_3/data/fit.log b/lab_3/data/fit.log
new file mode 100644
index 0000000..3e477d6
--- /dev/null
+++ b/lab_3/data/fit.log
@@ -0,0 +1,288 @@
+
+
+*******************************************************************************
+Mon Nov  4 15:58:15 2019
+
+
+FIT:    data read from 'diode.dat' using 1:2
+        format = x:z
+        #datapoints = 10
+        residuals are weighted equally (unit weight)
+
+function used for fitting: f(x)
+	f(x) = a*x +b
+fitted parameters initialized with current variable values
+
+iter      chisq       delta/lim  lambda   a             b            
+   0 1.2400030000e+06   0.00e+00  3.48e+01    1.000000e+00   1.000000e+00
+   6 9.6489173663e+00  -2.10e-08  3.48e-05   -1.668582e+00   4.777908e+02
+
+After 6 iterations the fit converged.
+final sum of squares of residuals : 9.64892
+rel. change during last iteration : -2.10241e-13
+
+degrees of freedom    (FIT_NDF)                        : 8
+rms of residuals      (FIT_STDFIT) = sqrt(WSSR/ndf)    : 1.09823
+variance of residuals (reduced chisquare) = WSSR/ndf   : 1.20611
+
+Final set of parameters            Asymptotic Standard Error
+=======================            ==========================
+a               = -1.66858         +/- 0.02581      (1.547%)
+b               = 477.791          +/- 1.272        (0.2662%)
+
+correlation matrix of the fit parameters:
+                a      b      
+a               1.000 
+b              -0.962  1.000 
+
+
+*******************************************************************************
+Mon Nov  4 15:58:43 2019
+
+
+FIT:    data read from 'diode.dat' using 1:2
+        format = x:z
+        #datapoints = 10
+        residuals are weighted equally (unit weight)
+
+function used for fitting: f(x)
+	f(x) = a*x +b
+fitted parameters initialized with current variable values
+
+iter      chisq       delta/lim  lambda   a             b            
+   0 1.2400030000e+06   0.00e+00  3.48e+01    1.000000e+00   1.000000e+00
+   6 9.6489173663e+00  -2.10e-08  3.48e-05   -1.668582e+00   4.777908e+02
+
+After 6 iterations the fit converged.
+final sum of squares of residuals : 9.64892
+rel. change during last iteration : -2.10241e-13
+
+degrees of freedom    (FIT_NDF)                        : 8
+rms of residuals      (FIT_STDFIT) = sqrt(WSSR/ndf)    : 1.09823
+variance of residuals (reduced chisquare) = WSSR/ndf   : 1.20611
+
+Final set of parameters            Asymptotic Standard Error
+=======================            ==========================
+a               = -1.66858         +/- 0.02581      (1.547%)
+b               = 477.791          +/- 1.272        (0.2662%)
+
+correlation matrix of the fit parameters:
+                a      b      
+a               1.000 
+b              -0.962  1.000 
+
+
+*******************************************************************************
+Mon Nov  4 15:59:43 2019
+
+
+FIT:    data read from 'diode.dat' using 1:2
+        format = x:z
+        #datapoints = 10
+        residuals are weighted equally (unit weight)
+
+function used for fitting: f(x)
+	f(x) = a*x +b
+fitted parameters initialized with current variable values
+
+iter      chisq       delta/lim  lambda   a             b            
+   0 1.2400030000e+06   0.00e+00  3.48e+01    1.000000e+00   1.000000e+00
+   6 9.6489173663e+00  -2.10e-08  3.48e-05   -1.668582e+00   4.777908e+02
+
+After 6 iterations the fit converged.
+final sum of squares of residuals : 9.64892
+rel. change during last iteration : -2.10241e-13
+
+degrees of freedom    (FIT_NDF)                        : 8
+rms of residuals      (FIT_STDFIT) = sqrt(WSSR/ndf)    : 1.09823
+variance of residuals (reduced chisquare) = WSSR/ndf   : 1.20611
+
+Final set of parameters            Asymptotic Standard Error
+=======================            ==========================
+a               = -1.66858         +/- 0.02581      (1.547%)
+b               = 477.791          +/- 1.272        (0.2662%)
+
+correlation matrix of the fit parameters:
+                a      b      
+a               1.000 
+b              -0.962  1.000 
+
+
+*******************************************************************************
+Mon Nov  4 16:00:07 2019
+
+
+FIT:    data read from 'diode.dat' using 1:2
+        format = x:z
+        #datapoints = 10
+        residuals are weighted equally (unit weight)
+
+function used for fitting: f(x)
+	f(x) = a*x +b
+fitted parameters initialized with current variable values
+
+iter      chisq       delta/lim  lambda   a             b            
+   0 1.2400030000e+06   0.00e+00  3.48e+01    1.000000e+00   1.000000e+00
+   6 9.6489173663e+00  -2.10e-08  3.48e-05   -1.668582e+00   4.777908e+02
+
+After 6 iterations the fit converged.
+final sum of squares of residuals : 9.64892
+rel. change during last iteration : -2.10241e-13
+
+degrees of freedom    (FIT_NDF)                        : 8
+rms of residuals      (FIT_STDFIT) = sqrt(WSSR/ndf)    : 1.09823
+variance of residuals (reduced chisquare) = WSSR/ndf   : 1.20611
+
+Final set of parameters            Asymptotic Standard Error
+=======================            ==========================
+a               = -1.66858         +/- 0.02581      (1.547%)
+b               = 477.791          +/- 1.272        (0.2662%)
+
+correlation matrix of the fit parameters:
+                a      b      
+a               1.000 
+b              -0.962  1.000 
+
+
+*******************************************************************************
+Mon Nov  4 16:00:31 2019
+
+
+FIT:    data read from 'diode.dat' using 1:2
+        format = x:z
+        #datapoints = 10
+        residuals are weighted equally (unit weight)
+
+function used for fitting: f(x)
+	f(x) = a*x +b
+fitted parameters initialized with current variable values
+
+iter      chisq       delta/lim  lambda   a             b            
+   0 1.2400030000e+06   0.00e+00  3.48e+01    1.000000e+00   1.000000e+00
+   6 9.6489173663e+00  -2.10e-08  3.48e-05   -1.668582e+00   4.777908e+02
+
+After 6 iterations the fit converged.
+final sum of squares of residuals : 9.64892
+rel. change during last iteration : -2.10241e-13
+
+degrees of freedom    (FIT_NDF)                        : 8
+rms of residuals      (FIT_STDFIT) = sqrt(WSSR/ndf)    : 1.09823
+variance of residuals (reduced chisquare) = WSSR/ndf   : 1.20611
+
+Final set of parameters            Asymptotic Standard Error
+=======================            ==========================
+a               = -1.66858         +/- 0.02581      (1.547%)
+b               = 477.791          +/- 1.272        (0.2662%)
+
+correlation matrix of the fit parameters:
+                a      b      
+a               1.000 
+b              -0.962  1.000 
+
+
+*******************************************************************************
+Mon Nov  4 16:01:04 2019
+
+
+FIT:    data read from 'diode.dat' using 1:2
+        format = x:z
+        #datapoints = 10
+        residuals are weighted equally (unit weight)
+
+function used for fitting: f(x)
+	f(x) = a*x +b
+fitted parameters initialized with current variable values
+
+iter      chisq       delta/lim  lambda   a             b            
+   0 1.2400030000e+06   0.00e+00  3.48e+01    1.000000e+00   1.000000e+00
+   6 9.6489173663e+00  -2.10e-08  3.48e-05   -1.668582e+00   4.777908e+02
+
+After 6 iterations the fit converged.
+final sum of squares of residuals : 9.64892
+rel. change during last iteration : -2.10241e-13
+
+degrees of freedom    (FIT_NDF)                        : 8
+rms of residuals      (FIT_STDFIT) = sqrt(WSSR/ndf)    : 1.09823
+variance of residuals (reduced chisquare) = WSSR/ndf   : 1.20611
+
+Final set of parameters            Asymptotic Standard Error
+=======================            ==========================
+a               = -1.66858         +/- 0.02581      (1.547%)
+b               = 477.791          +/- 1.272        (0.2662%)
+
+correlation matrix of the fit parameters:
+                a      b      
+a               1.000 
+b              -0.962  1.000 
+
+
+*******************************************************************************
+Mon Nov  4 16:01:25 2019
+
+
+FIT:    data read from 'diode.dat' using 1:2
+        format = x:z
+        #datapoints = 10
+        residuals are weighted equally (unit weight)
+
+function used for fitting: f(x)
+	f(x) = a*x +b
+fitted parameters initialized with current variable values
+
+iter      chisq       delta/lim  lambda   a             b            
+   0 1.2400030000e+06   0.00e+00  3.48e+01    1.000000e+00   1.000000e+00
+   6 9.6489173663e+00  -2.10e-08  3.48e-05   -1.668582e+00   4.777908e+02
+
+After 6 iterations the fit converged.
+final sum of squares of residuals : 9.64892
+rel. change during last iteration : -2.10241e-13
+
+degrees of freedom    (FIT_NDF)                        : 8
+rms of residuals      (FIT_STDFIT) = sqrt(WSSR/ndf)    : 1.09823
+variance of residuals (reduced chisquare) = WSSR/ndf   : 1.20611
+
+Final set of parameters            Asymptotic Standard Error
+=======================            ==========================
+a               = -1.66858         +/- 0.02581      (1.547%)
+b               = 477.791          +/- 1.272        (0.2662%)
+
+correlation matrix of the fit parameters:
+                a      b      
+a               1.000 
+b              -0.962  1.000 
+
+
+*******************************************************************************
+Mon Nov  4 16:33:45 2019
+
+
+FIT:    data read from 'diode.dat' using 1:2
+        format = x:z
+        #datapoints = 10
+        residuals are weighted equally (unit weight)
+
+function used for fitting: f(x)
+	f(x) = a*x +b
+fitted parameters initialized with current variable values
+
+iter      chisq       delta/lim  lambda   a             b            
+   0 1.2400030000e+06   0.00e+00  3.48e+01    1.000000e+00   1.000000e+00
+   6 9.6489173663e+00  -2.10e-08  3.48e-05   -1.668582e+00   4.777908e+02
+
+After 6 iterations the fit converged.
+final sum of squares of residuals : 9.64892
+rel. change during last iteration : -2.10241e-13
+
+degrees of freedom    (FIT_NDF)                        : 8
+rms of residuals      (FIT_STDFIT) = sqrt(WSSR/ndf)    : 1.09823
+variance of residuals (reduced chisquare) = WSSR/ndf   : 1.20611
+
+Final set of parameters            Asymptotic Standard Error
+=======================            ==========================
+a               = -1.66858         +/- 0.02581      (1.547%)
+b               = 477.791          +/- 1.272        (0.2662%)
+
+correlation matrix of the fit parameters:
+                a      b      
+a               1.000 
+b              -0.962  1.000