function [sbtl,istat0]=read_xls_o2(nfile,isheet,nbtl)
%nfile is the file name (.xlsx)
%nbtl is the maximum number of bottles
%%
if 0 %for tests
cd /Users/ganacho/Dropbox/Pandora/Oxygen
nfile='PANDORA_O2_Stations_021_a_030.xlsx'
xlsxfinfo(nfile)
nbtl=22;isheet=10
end
datao2 = xlsread(nfile, isheet);
lines2read=20:20+nbtl-1;
sbtl.btlid=datao2(lines2read,1);
sbtl.temp=datao2(lines2read,2);
sbtl.sali=datao2(lines2read,3);
sbtl.flask=datao2(lines2read,8);
sbtl.o2ml=datao2(lines2read,12);
sbtl.o2kg=datao2(lines2read,13);
sbtl.pres=datao2(lines2read,14);
istat0=datao2(1,3);