Used all runs in rec/rec_v0406, Run30xxxx_rec.000.slcio

Total number of runs: Period 1 148 runs
                      Period 3 145 runs

With beamData: Period 1 131 runs
               Period 3 130 runs

With normal incidence: Period 1 66 runs
                       Period 3 130 runs

With good fit to spread matrix: Period 1 X 37 runs
                                Period 1 Y 39 runs
                                Period 3 X 38 runs
                                Period 3 Y 56 runs

Gaussian fits/estimates to drift velocities
 X Layer 1  0.1471 +/- 0.0004
 X Layer 2  0.1463 +/- 0.0003
 X Layer 3  0.1376 +/- 0.0004

 Y Layer 1  0.1385 +/- 0.0007
 Y Layer 2  0.1303 +/- 0.0003
 Y Layer 3  0.1202 +/- 0.0006

Cross check with mean shifts, correcting for z differences
 X Dz1 = 60000-  43.5=59956.5,  Y Dz1 = 60000-  14.5=59985.5,
   Dz2 = 60000- 694.5=59305.5,    Dz2 = 60000- 665.5=59334.5,
   Dz3 = 60000-2542.5=57457.5,    Dz3 = 60000-2513.5=57486.5

 Assuming beam motion is purely angular, then gradient = vdi*Dzj/vdj*Dzi

 X Layer 2 vs layer 1 measured gradient = 1.01 +/- 0.01
       With i=1, j=2, expected gradient = 0.99 +/- 0.01

 X Layer 3 vs layer 1 measured gradient = 1.03 +/- 0.01
       With i=1, j=3, expected gradient = 1.02 +/- 0.01

 X Layer 3 vs layer 2 measured gradient = 1.01 +/- 0.01
       With i=2, j=3, expected gradient = 1.03 +/- 0.01

 Y Layer 2 vs layer 1 measured gradient = 1.06 +/- 0.01
       With i=1, j=2, expected gradient = 1.05 +/- 0.01

 Y Layer 3 vs layer 1 measured gradient = 1.09 +/- 0.01
       With i=1, j=3, expected gradient = 1.10 +/- 0.01

 Y Layer 3 vs layer 2 measured gradient = 1.03 +/- 0.01
       With i=2, j=3, expected gradient = 1.05 +/- 0.01


Alignment t0 values
 X Define "nominal" beam axis to correspond to Layer 1  t0 = -20 TDC units
   From Layer 2 vs Layer 1 means, Layer 2 t0 =  84-1.01*20 =  64 +/- 1 TDC units
   From Layer 3 vs Layer 1 means, Layer 3 t0 = -41-1.03*20 = -62 +/- 1 TDC units
  Cross check
   From Layer 3 vs Layer 2 means, Layer 3 t0 =-127+1.01*64 = -62 +/- 1 TDC units

 Y Define "nominal" beam axis to correspond to Layer 1  t0 =   0 TDC units
   From Layer 2 vs Layer 1 means, Layer 2 t0 =  50-1.06* 0 =  50 +/- 1 TDC units
   From Layer 3 vs Layer 1 means, Layer 3 t0 =  62-1.09* 0 =  62 +/- 1 TDC units
  Cross check
   From Layer 3 vs Layer 2 means, Layer 3 t0 =  11+1.03*50 =  63 +/- 1 TDC units