http://hallaweb.jlab.org/adaq/log/html/9904_archive/990405175058.html  charge calibration
http://marat-rvachev2.jlab.org/php/   database of Marat
Incident electron energy = 1257.2 MeV
solid angle  = delta_ph*delta_th.
electron arm  using ntuple 50 => single _e   condition
For wide open ph_tgte, delta_phtgt_e = .056 sr, delta_th_tgte = 0.1091 from the web. I used  delta_th_tge = 0.16 to account for resolution, but the actual opening is taken to be the web values. In the analysis I set |th_tgte|<.08, corresponding to wide open in th_tgte direction. Used |reactze|<.02 .

hadron arm using ntuple 51 => single_h condition
Used |th_tgtp|<.15 because there is multiple scattering in the proton arm. Used |ph_tgtp|<.08 for wide open in phi direction. Used |reactzh|<.02 .

pressure sensor used = hasc200_6_sensor_2_R should be pt267, target fill line
temperature sensor used = haItc502_5_sensor_2_R should be ct170 at inlet to gas cell
for p =154psi, T=6.3K expect from DJM's chart that rho = 0.0672 g/cm3 => rho = 1.349e23 nuclei/cm3 => rho(3he)*t=5.396e22/cm2

for radiative corrections use: rho(3He)=0.0672 g/cm3 => at 10cm(total gas path),  rho(3he)*t = 0.672 g/cm2
                                                rho(Al) = 2.70 g/cm3) => at 0.020"(total wall thickness), rho(Al)*t = 0.138 g/cm2
                                                X0(3He) = 3/4* (94.32 g/cm2) = 70.74 g/cm2
                                                X0(Al) =   24.01 g/cm2

Beam heating effects are uncertain at this time. There does not seem to be more than a 2% effect between 0 uA and 15 uA from the following source.
 http://www.calstatela.edu/academic/nuclear_physics/89044/Iscan.htm . The hadron counts/Q are a measure of beam heating. There does not seem to be any beam heating for runs 2592-2630
Q2 /fm2 2.79 5.03 5.01 11.01 14.98 19.06 19.06
run number 2592 2601 3034 2608 2613 2628 2630
<current> uA 2.2 5 4.8 59.3 95 96 97
charge, mC 2.4434 1.0826 5.668  79.52 293.8 145.3 341.92
pressure(psi)
temperature(K)		 153.93
6.3		 153.98
6.29		 157.96
6.31		 155.36
6.29		 156.25
6.3		 153.98
6.31		 156.24
6.3
electron_angle 15.19 20.56 20.57 31.16 36.96 42.46 42.46
electron_energy 1238.15 1222.65 1222.62 1181.22 1153.74 1125.40 1125.40
e  energy loss 18.85 34.35 34.38 75.78 103.74 131.6 131.6
delta_E for rad. corr. 1.8 1.8 1.8 1.8 1.8 1.8 1.8
counts_electron
|ph_tgte|<.02
solid_angle = 0.004364 sr		 29805 8204 50425 2355+-50 5642(77)   1583(41)
counts_electron
ph_tgte open
solid angle = 0.00611 sr		 46325 13195 80535 na na   na
ps1 160 10 8 1 1 1 2
trig_1 raw 135612980 2270170 12398942 1936175 1423710 270002 619865
trig_1 accepted 825894 221909 1358946 1560818 1299562 255771 301102
live_time_e 164.2 10.23 9.12 1.24 1.096 1.056 2.059
ext*int_brems 0.830*0.737 0.830*0.726 0.830*0.726 0.831*0.712 0.832*0.707 0.833*0.703 0.833*0.703
beam heating 1 1 1 1 ** 1.02 1
<sigma, small> cm2/sr 2.23e-30 8.75e-32 9.16e-32 4.22e-35 2.48e-35 7.34e-36
<sigma, big>
cm2/sr		 2.48e-30 10.05e-32 10.45 na na
sigma small
amroun avg		 2.29e-30 9.04e-32 8.98e-32 4.04e-35 2.40e-35 1.02e-35
sigma small otterman avg 2.28e-30 na na na na na na
sigma avg
U Mass small		 2.61-30 1.28e-31 1.27e-31 5.26e-34 5.41e-33 1.18e-35
corr_e/corr_h*
counts_hadron
|ph_tgtp|<.02
solid_angle = 0.004396 sr		 16875 3538 18535, note this is at a different setting 17825 48305 64565
counts_hadron
|ph_tgtp|<.08
solid angle = 0.006220 sr		 24355 5114 26345,note this is at a different setting 24445 67935 92985
ps3 2 4 10 60 88 80 81
trig_3 raw 213870 93086 1238428 6641876 24470756 12107650 28487755
trig_3 accepted 92287 19595 89479 90127 257128  145541 342337
live_time_h 2.32 4.75 13.84 73.69 95.17 83.19 83.2
correct_h/Q
small solid ang
cnts/mC		 16023 15523 not relevant 16518 15647 15711
correct_h/Q
large solid ang
counts/mC		 23125 22438 not relevant 22653 22006 22626
* corr_e = cnts_e(|ph_tgte|<.02)*livetime_e/(rad_corr)
   corr_h = cnts_h(ph_tgtp|<.08)*livetime_h
** beam heating from comparison of hadron/mC - no change seen!