Sunspot numbers obtained by different networks in 2001
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     SIDC SONNE SONNE AAVSO   AKS   BAA GFOES GSRSI   OAA   RWG   TOS   VVS
    prov. prov.  def. prov.   (D)  (GB)   (F)   (I)   (J)  (CH)  (PL)   (B)

Jan  95.1  99.4  96.8 131.8  97.2 111.5 110.7 130.2 113.0 115.1 114.5 122.1
Feb  80.1  85.6  83.1 106.9    .   90.8 103.3 113.8  95.4  96.8  99.1 103.4
Mar 114.2 116.1 115.5 147.4    .  123.4 126.7 157.0 128.6 137.7 133.4 150.7
Apr 108.2 112.7    .  141.1    .  122.3 112.8    .     .  128.4 123.8 142.6
May  97.3 100.7    .  125.0    .     .   99.1 146.4    .     .     .     . 
Jun    .     .     .     .     .     .     .     .     .     .     .     . 
Jul    .     .     .     .     .     .     .     .     .     .     .     . 
Aug    .     .     .     .     .     .     .     .     .     .     .     . 
Sep    .     .     .     .     .     .     .     .     .     .     .     . 
Oct    .     .     .     .     .     .     .     .     .     .     .     . 
Nov    .     .     .     .     .     .     .     .     .     .     .     . 
Dec    .     .     .     .     .     .     .     .     .     .     .     . 

SIDC: Sunspot Index Data Center, Brussels (International sunspot numbers)
SONNE prov.: SONNE network, provisional sunspot numbers 
SONNE def.: SONNE network, definitive sunspot numbers
AAVSO: American Association of Variable Star Observers - Solar Division
AKS: Arbeitskreis Sonne des Kulturbundes e.V., Germany
BAA: The British Astronomical Association - Solar Section, UK
GFOES: G.F.O.E.S. Commission "Nombre de Wolf", France
GSRSI: GruppoSole Ricerce Solari Italia, Italy
OAA: The Oriental Astronomical Association - Solar Division, Japan
RWG: Rudolf Wolf Gesellschaft - Solar Obs. Group of Swiss Astron. Society
TOS: Towarzystwo Obserwatorow Slonca - Solar Observers Society, Poland
VVS: Vereniging voor Sterrenkunde, Werkgroep Zon, Belgium