--- a/FXAnalyse.c	Tue Feb 04 17:07:59 2014 +0100
+++ b/FXAnalyse.c	Mon Feb 10 14:44:41 2014 +0100
@@ -186,19 +186,17 @@
 int nobs = 0;
 int settling = 0;
 
-double f0_DDS1 = 110000000.0, f0_DDS2, f0_DDS3;
+double f0_DDS1 = 110000000.0, f0_DDS2, f0_DDS3, df_DDS3;
 
-double N_1=0.0, N_2=0.0, N_3=0.0;
 double SlopeTime1=40.0, DeltaT_1=20.0, delta_f_lock_1=500.0;
 double SlopeTime2=40.0, DeltaT_2=20.0, delta_f_lock_2=500.0;
 double SlopeTime3=40.0, DeltaT_3=20.0, delta_f_lock_3=500.0;
 
-double DeltaDDS3=0.0;
-
 double t1, t2, t3;
 double f_rep_slope, f_beat_slope;
 double f_rep_plus, f_rep_minus;
 double f_beat_plus, f_beat_minus;
+double N_measured; 
 
 double Frequencystep1=10000.0, tbegin1=0.0, Frepbefore1=0.0, Frequency1=0.0;
 double Frequencystep2=10.0, tbegin2=0.0, Frepbefore2=0.0, Ch2before=0.0, Frequency2=0.0;
@@ -791,8 +789,8 @@
 							
 							// compute N1
 							double delta_f_rep = f_rep_minus - f_rep_plus;
-							N_1 = Sign1 * 2 * Ndiv * delta_f_lock_1 / delta_f_rep;
-							SetCtrlVal(CalcNPanel, CALCN_N, N_1);
+							N_measured = Sign1 * 2 * Ndiv * delta_f_lock_1 / delta_f_rep;
+							SetCtrlVal(CalcNPanel, CALCN_N, N_measured);
 							
 							// back to nominal frep
 							DDS4xAD9912_RampFrequency(&DDS4xAD9912, 1, f0_DDS1, FREP_STEP_SIZE);
@@ -848,7 +846,7 @@
 							
 							// adjust DDS3 to keep beatnote within the bandpass filter. prediction
 							double fDDS3 = f0_DDS3 + Sign1 * Sign2 * N2/N1 * Ndiv * delta_f_lock_2;
-							DeltaDDS3 = fDDS3 - DDS4xAD9912_GetFrequency(&DDS4xAD9912, 3);
+							df_DDS3 = fDDS3 - DDS4xAD9912_GetFrequency(&DDS4xAD9912, 3);
 							DDS4xAD9912_SetFrequency(&DDS4xAD9912, 3, fDDS3);
 						
 							// allow counter to settle
@@ -870,7 +868,7 @@
 						DDS4xAD9912_SetFrequency(&DDS4xAD9912, 2, fDDS2);
 						
 						double fDDS3 = DDS4xAD9912_GetFrequency(&DDS4xAD9912, 3) + 10000 - Ch2;
-						DeltaDDS3 = DeltaDDS3 + 10000 - Ch2;
+						df_DDS3 = df_DDS3 + 10000 - Ch2;
 						DDS4xAD9912_SetFrequency(&DDS4xAD9912, 3, fDDS3);
 
 						// allow counter to settle
@@ -904,7 +902,7 @@
 							
 							// adjust DDS3 to keep beatnote within the bandpass filter. prediction
 							double fDDS3 = f0_DDS3 - Sign1 * Sign2 * N2/N1 * Ndiv * delta_f_lock_2;
-							DeltaDDS3 = fDDS3 - DDS4xAD9912_GetFrequency(&DDS4xAD9912, 3);
+							df_DDS3 = fDDS3 - DDS4xAD9912_GetFrequency(&DDS4xAD9912, 3);
 							DDS4xAD9912_SetFrequency(&DDS4xAD9912, 3, fDDS3);
 
 							// allow counter to settle
@@ -940,8 +938,8 @@
 							logmsg("delta frep: measured=%e expected=%e difference=%e",
 								delta_f_rep_m, delta_f_rep, delta_f_rep_m - delta_f_rep);
 							
-							N_2 = -Sign2 * (DeltaDDS3 + f_beat_minus - f_beat_plus) / delta_f_rep;
-							SetCtrlVal(CalcNPanel, CALCN_N, N_2);
+							N_measured = -Sign2 * (df_DDS3 + f_beat_minus - f_beat_plus) / delta_f_rep;
+							SetCtrlVal(CalcNPanel, CALCN_N, N_measured);
 							
 							// back to nominal frequency
 							DDS4xAD9912_RampFrequency(&DDS4xAD9912, 1, f0_DDS1, FREP_STEP_SIZE);
@@ -1100,10 +1098,10 @@
 							logmsg("delta fbeat: measured=%e expected=%e difference=%e",
 								delta_f_beat, delta_f_beat_expected, delta_f_beat - delta_f_beat_expected);
 							
-							N_3 = delta_f_beat / delta_f_rep;
-							SetCtrlVal(CalcNPanel, CALCN_N, N_3);
+							N_measured = delta_f_beat / delta_f_rep;
+							SetCtrlVal(CalcNPanel, CALCN_N, N_measured);
 							
-							logmsg("measured N3=%.3f", N_3);
+							logmsg("measured N3=%.3f", N_measured);
 							
 							// back to nominal frep
 							DDS4xAD9912_RampFrequency(&DDS4xAD9912, 1, f0_DDS1, FREP_STEP_SIZE);
@@ -1536,15 +1534,15 @@
 			GetPanelAttribute(panel, ATTR_CALLBACK_DATA, &measure);
 			switch (measure) {
 				case LO:
-					N1 = round(N_1);
+					N1 = round(N_measured);
 					SetCtrlVal(MainPanel, PANEL_N1CHOICE, N1);
 					break;
 				case HG:
-					N2 = round(N_2);
+					N2 = round(N_measured);
 					SetCtrlVal(MainPanel, PANEL_N2CHOICE, N2);
 					break;
 				case SR:
-					N3 = round(N_3);
+					N3 = round(N_measured);
 					SetCtrlVal(MainPanel, PANEL_N3CHOICE, N3);
 					break;
 			}