Used all ECAL+HCAL runs in rec/rec_v0406, Run33xxxx_rec.000.slcio

Total number of runs: Period 5 91 runs

With beamData: Period 5 90 runs

With normal incidence: Period 5 42 runs

With good fit to spread matrix: Period 5 X 26 runs
                                Period 5 Y 19 runs


Gaussian fits/estimates to drift velocities
 X Layer 1  0.1375 +/- 0.0007
 X Layer 2  0.1419 +/- 0.0009
 X Layer 3  0.1352 +/- 0.0006

 Y Layer 1  0.129  +/- 0.001
 Y Layer 2  0.138  +/- 0.001
 Y Layer 3  0.132  +/- 0.001

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- 713.5=59286.5,    Dz2 = 60000- 684.5=59315.5,
   Dz3 = 60000-2586.5=57413.5,    Dz3 = 60000-2557.5=57442.5

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

 X Layer 2 vs layer 1 measured gradient = 0.95 +/- 0.01
       With i=1, j=2, expected gradient = 0.96 +/- 0.01

 X Layer 3 vs layer 1 measured gradient = 0.97 +/- 0.01
       With i=1, j=3, expected gradient = 0.97 +/- 0.01

 X Layer 3 vs layer 2 measured gradient = 1.02 +/- 0.01
       With i=2, j=3, expected gradient = 1.02 +/- 0.01

 Y Layer 2 vs layer 1 measured gradient = 0.86 +/- 0.15
       With i=1, j=2, expected gradient = 0.92 +/- 0.01

 Y Layer 3 vs layer 1 measured gradient = 0.92 +/- 0.13
       With i=1, j=3, expected gradient = 0.94 +/- 0.01

 Y Layer 3 vs layer 2 measured gradient = 1.09 +/- 0.15
       With i=2, j=3, expected gradient = 1.01 +/- 0.01


Alignment t0 values
 X Define "nominal" beam axis to correspond to Layer 1  t0 =  50 TDC units
   From Layer 2 vs Layer 1 means, Layer 2 t0 =  -6+0.95*50 =  41 +/- 1 TDC units
   From Layer 3 vs Layer 1 means, Layer 3 t0 = -13+0.97*50 =  36 +/- 1 TDC units
  Cross check
   From Layer 3 vs Layer 2 means, Layer 3 t0 =  -6+1.02*41 =  35 +/- 1 TDC units

 Y Define "nominal" beam axis to correspond to Layer 1  t0 = -28 TDC units
   From Layer 2 vs Layer 1 means, Layer 2 t0 =   3-0.86*28 = -21 +/- 6 TDC units
   From Layer 3 vs Layer 1 means, Layer 3 t0 =  15-0.92*28 = -11 +/- 6 TDC units
  Cross check
   From Layer 3 vs Layer 2 means, Layer 3 t0 =  12-1.09*21 = -11 +/- 6 TDC units