2 curves ... frustrating

[jouke hijlkema <hylkema free fr>]

Goodday,

I'm having a little problem that frustrates me a lot ... I have to data 
series one for 2007 and one for 2008. Dates coupled to values. I try to 
put both curves in one plot. I can't get both curves to superimpose, I 
tried to substract 365 from the 2007 dates but that doesn't work. I'm 
sure this must be possible but I can't get it to work ... help please.

Jouke

data for 2007:

27-Jan    0
29-Jan    19
30-Jan    27
1-Feb    31
2-Feb    35
4-Feb    44
5-Feb    46
26-Feb    104
2-Mar    113
12-Mar    115
15-Mar    122
26-Mar    160
28-Mar    166
30-Mar    172
5-Apr    193
10-Apr    202
21-Apr    214
23-Apr    214
27-Apr    215
2-May    218
5-May    223
15-May    232
23-May    238
29-May    247
23-Jun    254
21-Jul    259
11-Sep    266
27-Sep    272
10-Oct    283
25-Oct    312
1-Nov    336
17-Nov    388
15-Dec    491

data for 2008:
1-Jan    548
12-Jan    624
8-Mar    818