integer res
integer cont
real(8) jdfirst, jdlast
res = calceph_sopen("example1.dat"//C_NULL_CHAR)
if (res.eq.1) then
res = calceph_sgettimespan(jdfirst, jdlast, cont)
write (*,*) "data available between ", jdfirst, "and", jdlast
write (*,*) "continuous data ", cont
call calceph_sclose
endif