28.2.2019: New simulations for PDfs in ep at LHeC
27.3.2019: added 5 and 50 fb-1
2.4.       added sets 12 and 13, 50fb-1 based
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Default: Ee=50 GeV, Ep = 7 TeV, protons
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For the CDR update:
 I have simulated the following data sets

1.  e-, P=-0.8     10 fb-1     dataempn10nc/cc

2.  e-  P=-0.8    100 fb-1     dataempn100nc/cc

3.  e-  P=0       100 fb-1     dataemp0100nc/cc

4.  e-  P=-0.8   1000 fb-1     dataempn1000nc/cc

5.  e-  P=0  Ep=1 TeV 1fb-1    dataemp0lowep1nc/cc

6.  e+  P=0        1 fb-1      dataepp01nc/cc

7.  e+  P=0       10 fb-1      dataepp010nc/cc

8.  e-  P=+0.8    10 fb-1      dataempp10nc/cc

9.  e-, P=-0.8     5 fb-1     dataempn5nc/cc

10. e-  P=-0.8    50 fb-1     dataempn50nc/cc

11. e-  P=0.      50 fb-1     dataemp050nc/cc

12. e-  P=+0.8    50 fb-1     dataempp50nc/cc

13. e+  P=0.      50 fb-      dataepp050nc/cc

The datasets are here
http://hep.ph.liv.ac.uk/~mklein/lhecdat219/dataempn10nc

The following combinations look particularly interesting to me:

A: effect of luminosity: compare A1 with A2
   A1   1 only   A2  4 only

B: effect of polarisation: compare B1 with B2
   B1 2 only (-0.8)   B2  2 (-0.8) and 8 (+0.8)
C: effect of polarisation: compare C1 with C2
   C1 3 only (P=0)    C2  3 and 1 (P=-0.8)
D: effect of polarisation: compare D1 with D2
   D1 3 only (P=0)    D2  3 and 8 (P=+0.8)

E: effect of positrons: compare E1=B1 with E2
   E1 = B1: 2 only   E2 2 + 6 (1fb-1)
F: effect of positrons: compare F1=B1 with F2
   E1 = B1: 2 only   E2 2 + 7 (10fb-1)

G: effect of low proton energy: compare G1=B1 with G2
   G1 = B1: 2 only   G2 2+ 5

H: ultimate and almost ultimate: compare H1 and H2
   H1: 4 + 5 + 7 +8   H2: 2 + 5 + 7 + 8
  [fun to arrive at 'H1' for ultimate.. :)]

There may be other combinations you find interesting.

one probably needs to define some key pdfs which can be compared, such as
xg, uv, dv, Ubar, Dbar in order to see anything..

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