function d17_he3calibrate,calfiles,main=main,water=water,mask=maskstring,F1=FF1,F2=FF2

                LAMP function to create a workspace with the values of phi,F1,F2 and transmission as a function of time. 

  The function uses d17_he3calc to calculate phi, F1 and F2,

                It then estimates the mean F1 and F2 (which are time-independent)

                It then recalculates phi (the only time-dependent quantity)

                The output has 7 rows:

                Row 1 = phi, calculated for each He3 calibration

                Row 2 = F1, calculated for each He3 calibration

                Row 3 = F2, calculated for each He3 calibration

                Row 4 = transmission, calculated for each He3 calibration

                Row 5 = phi calculated from the mean value of F1 below

                                                OR, using the optional F1 and/or F2 if specified

                Row 6 = the mean F1 for all the He3 calibration files

                Row 7 = the mean F2 for all the He3 calibration files

                The errors have also been estimated assuming Poissonian statistics

NECESSARY VARIABLES:

                calfiles=a string with ALL the 3He calibration runs included

                                The first and last file for each calibration scan must be

                                separated by a colon (:)

                                Separate calibration scans must be separated by a comma (,)

OPTIONAL VARIABLES:

                main=a string with the numbers for a measurement of the main beam, with an empty cell

                water=the number of the workspace with the (masked) water file in it. 

                                The data will be divided by this workspace if it exists

                maskstring=your choice of masking the detector, written as a string.  See maskme for more information on syntax.

                                                The default is no mask

                FF1 = a two element array with the first flipper efficiency and its error

                                Specify this if you want to force F1 to a value

                FF2 = a two element array with the second flipper efficiency and its error

                                Specify this if you want to force F2 to a value

e.g. w1=d17_he3calibrate('97087:97093,97339:97345,97591:97597',main='90201',water=1,mask='box,[190,200,63,222]')