diff --git a/statics/physics/modern-phys-lab/counting/100-1.csv b/statics/physics/modern-phys-lab/counting/100-1.csv
new file mode 100644
index 0000000..f967163
--- /dev/null
+++ b/statics/physics/modern-phys-lab/counting/100-1.csv
@@ -0,0 +1,1049 @@
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diff --git a/statics/physics/modern-phys-lab/counting/100-2.csv b/statics/physics/modern-phys-lab/counting/100-2.csv
new file mode 100644
index 0000000..2bb1c8d
--- /dev/null
+++ b/statics/physics/modern-phys-lab/counting/100-2.csv
@@ -0,0 +1,1049 @@
+Spectrum Name:
+Description:
+Student ID:
+Detector Used:
+Comments:
+Acquisition Mode:,MCS Internal
+High Voltage:,650
+Conversion Gain:,1024
+Coarse Gain:,1
+Fine Gain:,1.73
+Upper Discriminator:,731
+Lower Discriminator:,591
+Calibration Coefficients:Elapsed Real Time:,0.0
+Elapsed Live Time:,0.0
+Start Time:,February 17, 2025, 03:05:56
+End Time:,February 17, 2025, 03:07:39
+ROIs:
+ROI:,Low,High,Gross,Net,FWHM,Centroid
+
+1,36,38,365,-1,0,37
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diff --git a/statics/physics/modern-phys-lab/counting/200.csv b/statics/physics/modern-phys-lab/counting/200.csv
new file mode 100644
index 0000000..cc7c50b
--- /dev/null
+++ b/statics/physics/modern-phys-lab/counting/200.csv
@@ -0,0 +1,1049 @@
+Spectrum Name:
+Description:
+Student ID:
+Detector Used:
+Comments:
+Acquisition Mode:,MCS Internal
+High Voltage:,650
+Conversion Gain:,1024
+Coarse Gain:,1
+Fine Gain:,1.73
+Upper Discriminator:,731
+Lower Discriminator:,591
+Calibration Coefficients:Elapsed Real Time:,0.0
+Elapsed Live Time:,0.0
+Start Time:,February 17, 2025, 02:59:58
+End Time:,February 17, 2025, 03:03:22
+ROIs:
+ROI:,Low,High,Gross,Net,FWHM,Centroid
+
+1,36,38,731,22,0,37
+2,96,206,27295,483,3,150
+3,299,300,505,1,0,299
+
+Channel Data:
+Channel,Energy,Counts
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diff --git a/statics/physics/modern-phys-lab/counting/40-1.csv b/statics/physics/modern-phys-lab/counting/40-1.csv
new file mode 100644
index 0000000..d741ced
--- /dev/null
+++ b/statics/physics/modern-phys-lab/counting/40-1.csv
@@ -0,0 +1,1049 @@
+Spectrum Name:
+Description:
+Student ID:
+Detector Used:
+Comments:
+Acquisition Mode:,MCS Internal
+High Voltage:,650
+Conversion Gain:,1024
+Coarse Gain:,1
+Fine Gain:,1.73
+Upper Discriminator:,731
+Lower Discriminator:,591
+Calibration Coefficients:Elapsed Real Time:,0.0
+Elapsed Live Time:,0.0
+Start Time:,February 17, 2025, 03:07:58
+End Time:,February 17, 2025, 03:08:39
+ROIs:
+ROI:,Low,High,Gross,Net,FWHM,Centroid
+
+1,36,38,154,12,0,37
+2,96,206,5345,238,2,150
+3,299,300,104,1,0,299
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diff --git a/statics/physics/modern-phys-lab/counting/40-2.csv b/statics/physics/modern-phys-lab/counting/40-2.csv
new file mode 100644
index 0000000..f530bfa
--- /dev/null
+++ b/statics/physics/modern-phys-lab/counting/40-2.csv
@@ -0,0 +1,1049 @@
+Spectrum Name:
+Description:
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+Detector Used:
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+Fine Gain:,1.73
+Upper Discriminator:,731
+Lower Discriminator:,591
+Calibration Coefficients:Elapsed Real Time:,0.0
+Elapsed Live Time:,0.0
+Start Time:,February 17, 2025, 03:09:06
+End Time:,February 17, 2025, 03:09:47
+ROIs:
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diff --git a/statics/physics/modern-phys-lab/counting/40-3.csv b/statics/physics/modern-phys-lab/counting/40-3.csv
new file mode 100644
index 0000000..b751cde
--- /dev/null
+++ b/statics/physics/modern-phys-lab/counting/40-3.csv
@@ -0,0 +1,1049 @@
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+Elapsed Live Time:,0.0
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diff --git a/statics/physics/modern-phys-lab/counting/40-4.csv b/statics/physics/modern-phys-lab/counting/40-4.csv
new file mode 100644
index 0000000..e582450
--- /dev/null
+++ b/statics/physics/modern-phys-lab/counting/40-4.csv
@@ -0,0 +1,1049 @@
+Spectrum Name:
+Description:
+Student ID:
+Detector Used:
+Comments:
+Acquisition Mode:,MCS Internal
+High Voltage:,650
+Conversion Gain:,1024
+Coarse Gain:,1
+Fine Gain:,1.73
+Upper Discriminator:,731
+Lower Discriminator:,591
+Calibration Coefficients:Elapsed Real Time:,0.0
+Elapsed Live Time:,0.0
+Start Time:,February 17, 2025, 03:11:08
+End Time:,February 17, 2025, 03:11:49
+ROIs:
+ROI:,Low,High,Gross,Net,FWHM,Centroid
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diff --git a/statics/physics/modern-phys-lab/counting/40-5.csv b/statics/physics/modern-phys-lab/counting/40-5.csv
new file mode 100644
index 0000000..6ef2107
--- /dev/null
+++ b/statics/physics/modern-phys-lab/counting/40-5.csv
@@ -0,0 +1,1049 @@
+Spectrum Name:
+Description:
+Student ID:
+Detector Used:
+Comments:
+Acquisition Mode:,MCS Internal
+High Voltage:,650
+Conversion Gain:,1024
+Coarse Gain:,1
+Fine Gain:,1.73
+Upper Discriminator:,731
+Lower Discriminator:,591
+Calibration Coefficients:Elapsed Real Time:,0.0
+Elapsed Live Time:,0.0
+Start Time:,February 17, 2025, 03:12:11
+End Time:,February 17, 2025, 03:12:52
+ROIs:
+ROI:,Low,High,Gross,Net,FWHM,Centroid
+
+1,36,38,168,12,0,36
+2,96,206,5339,509,4,151
+3,299,300,89,2,0,299
+
+Channel Data:
+Channel,Energy,Counts
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diff --git a/statics/physics/modern-phys-lab/counting/run.py b/statics/physics/modern-phys-lab/counting/run.py
new file mode 100644
index 0000000..01c816b
--- /dev/null
+++ b/statics/physics/modern-phys-lab/counting/run.py
@@ -0,0 +1,20 @@
+import numpy as np
+
+def read_file(file: str) -> np.typing.ArrayLike:
+    with open(f'{file}.csv', 'r') as file:
+        lines = file.read().split('Channel,Energy,Counts')[1].strip().split('\n')
+        return np.array([int(line.split(',,')[1]) for line in lines])
+
+all_data = {
+    '200': read_file('200'),
+    '100': read_file('100-1') + read_file('100-2'),
+    '40': sum([read_file(f'40-{i}') for i in range(1, 6)])
+}
+
+for time in all_data:
+    data = all_data[time]
+
+    mean = np.mean(data)
+    print(f'Found sample mean {mean}')
+
+    stdev = np.stdev(mean, ddof=1)
\ No newline at end of file
diff --git a/statics/physics/modern-phys-lab/diffraction.py b/statics/physics/modern-phys-lab/diffraction.py
index cbd3efa..42e7a95 100644
--- a/statics/physics/modern-phys-lab/diffraction.py
+++ b/statics/physics/modern-phys-lab/diffraction.py
@@ -1,24 +1,23 @@
 import numpy as np
 import matplotlib.pyplot as plt
 
-# Current units: pixels
-# Format: d[0 = small, 1 = large][voltage][0 = inner, 1 = outer]
-diameter_measured = np.array([
-    [[570, 646], [567, 725], [623, 750], [730, 866], [800, 962], [861, 1051]],
-    [[968, 1090], [1034, 1147], [1036, 1183], [1311, 1461], [1405, 1624], [1476, 1600]]
-])
-diameter_error = 100
-
+# Units: V
 voltages = np.array(np.arange(5000, 2500 - 1, -500)) #-1 to include 2500
 voltages_inv_sqrt = 1 / np.sqrt(voltages)
 
 # New units: m
-diameter_measured = diameter_measured / 19440
-diameter_measured_error = 100 / 19440
+diameter_measured_error = 0.02
 
 # Average inner and outer
 # New format: d[0 = small, 1 = large][voltage]
-diameter_measured = np.average(diameter_measured, axis=2)
+diameter_measured = np.array([
+    [0.0, 0.024, 0.022, 0.019, 0.02],
+    [0.0, 0.04, 0.0385, 0.036, 0.035]
+])
+
+diameter_error = 100
+print(diameter_measured[0][4])
+
 
 # Find actual diameter
 L = 138 / 1000
@@ -40,19 +39,28 @@ for size in range(len(diameter_measured)):
 
     # Trendlines
     line = np.polynomial.Polynomial.fit(voltages_inv_sqrt, diameter_measured[size], deg=1)
-    ax.plot(voltages_inv_sqrt, line(voltages_inv_sqrt), label='Trendline', linestyle='--', color='purple')
+    ax.plot(voltages_inv_sqrt, line(voltages_inv_sqrt), label=f'Trendline', linestyle='--', color='purple')
     ax.legend()
 
+    # D_E
+    d = (0.123 if size == 1 else 0.213) * 10**(-9)
+
+    # error
+    delta = sum(1 / diameter_actual_error[size]**2) * sum((voltages_inv_sqrt ** 2) / (diameter_actual_error[size] ** 2)) - sum(voltages_inv_sqrt / (diameter_actual_error[size] ** 2))**2
+    slope_error = np.sqrt((1 / delta) * sum(1 / diameter_actual_error[size]**2))
+
+    alpha = np.sqrt(2) * L * (6.63 * 10**(-34)) / (d * np.sqrt((9.1093837 * 10**(-31)) * (1.60217663 * 10**(-19))))
+
     ax=axs[size][1]
     ax.set_xlabel(r'$1/\sqrt{U_0}$')
     ax.set_ylabel(f'$D_E$ ({size_name}) (meters)')
-    ax.set_title(r'$1/\sqrt{U_0}$ ' + f'vs $D_E$ ({size_name})')
+    ax.set_title(r'$1/\sqrt{U_0}$ ' + f'vs $D_E$ ($\\alpha = {alpha:0.6f}$), ({size_name})')
     #ax.scatter(voltages_inv_sqrt, diameter_measured[size], label='Data')
-    ax.errorbar(voltages_inv_sqrt, diameter_actual[size], fmt='o', yerr=diameter_actual_error, capsize=5)
+    ax.errorbar(voltages_inv_sqrt, diameter_actual[size], fmt='o', yerr=diameter_actual_error[size], capsize=5)
 
     # Trendlines
     line = np.polynomial.Polynomial.fit(voltages_inv_sqrt, diameter_actual[size], deg=1)
-    ax.plot(voltages_inv_sqrt, line(voltages_inv_sqrt), label='Trendline', linestyle='--', color='purple')
+    ax.plot(voltages_inv_sqrt, line(voltages_inv_sqrt), label=f'Trendline {line.convert()} (err {slope_error:0.4f})', linestyle='--', color='purple')
     ax.legend()
 
 plt.show()
\ No newline at end of file