diff --git a/lab_4/lab_4.m b/lab_4/lab_4.m
index 4b0b1e9..798d09c 100644
--- a/lab_4/lab_4.m
+++ b/lab_4/lab_4.m
@@ -2,11 +2,11 @@
 
 % use these fields to select the task that should be calculated
 do_task1 = false;
-do_task2 = false;
-do_task3_1 = false;
-do_task3_2 = false;
+do_task2 = true;
+do_task3_1 = true;
+do_task3_2 = true;
 do_task3_2_simple_calc = true;
-do_task4 = false;
+do_task4 = true;
 
 carrier_frequency = 2.4e9;
 wifi_be_subcarrier_spacing = 78.125e3;
@@ -79,7 +79,7 @@ end
 if do_task3_2_simple_calc
     carrier_frequencies = [1e9 2.4e9 5e9 5.8e9 6e9 12e9 24e9 60e9];
     meanDopplerShifts = zeros(1, numel(carrier_frequencies));
-    parfor f_idx = 1 : numel(carrier_frequencies);
+    parfor f_idx = 1 : numel(carrier_frequencies)
         dopplerShifts = arrayfun(@(el) dopplerShiftCircularOrbit(el, leo_altitude, 0, carrier_frequencies(f_idx)), elevationAngles);
         meanDopplerShifts(f_idx) = mean(dopplerShifts);
     end
@@ -90,4 +90,9 @@ if do_task3_2_simple_calc
     for f_idx = 1 : numel(carrier_frequencies)
         fprintf("| %.1f GHz | ~%.2fkHz | ~%.2f |\n", carrier_frequencies(f_idx) / 1e9, meanDopplerShifts(f_idx) / 1e3, meanDopplerShifts(f_idx) / wifi_be_subcarrier_spacing);
     end
-end
\ No newline at end of file
+end
+
+if do_task4
+    use_t1_as_t4 = true;
+    task1;
+end