function d17_waterdef,nums,dims=dims,mask=maskstring

               LAMP function to load in a water run, mask it and normalize it

 NECESSARY INPUT:

                nums=a string with the filenumbers containing the data.

                                Consecutive files are separated by a greater than (>)

                                Add non-consecutive files using a plus (+)

                                The string must be enclosed in quotation marks (')

                                e.g. '90230>90240+90250>90260'

 OPTIONAL INPUT:

                dims=the dimension of the output workspace.  Can be 1 or 2. 

                                If nothing is specified, the output workspace will have the same dimensions as the input data

                maskstring=your choice of masking the detector, written as a string

                                                The default is no mask

                e.g. type at LAMP interface:

                                w1=d17_waterdef('90230+90250',dims=1,mask='box,[190,200,63,222]')