Increase amplitude variability

Testing what effect this has on methods - performance on amplitudes is
currently very similar.

RunTests.m

@@ -166,8 +166,8 @@ modeOptions.P.registration.form = 'Null';
 
 options.An.form = 'Freq';
 % Amplitude variability
-options.An.amp.a = 50.0;
-options.An.amp.b = 50.0;
+options.An.amp.a = 10.0;
+options.An.amp.b = 10.0;
 % Proportion of modes missing (per subject & mode)
 options.An.offRate = 0.05 * 1/params.N;  % 1/20 subjects has a missing mode
 switch options.An.form