library(data.table)
data("MOD13A1")

dt <- tidy_MOD13(MOD13A1$dt)
st <- MOD13A1$st

sitename <- dt$site[1]
d     <- dt[site == sitename, ] # get the first site data
sp    <- st[site == sitename, ] # station point
# global parameter
IsPlot = TRUE
print  = FALSE
nptperyear = 23
ypeak_min  = 0.05
south      = sp$lat < 0

dnew  <- add_HeadTail(d, south, nptperyear) # add one year in head and tail
INPUT <- check_input(dnew$t, dnew$y, dnew$w, dnew$QC_flag,
	nptperyear, south = south,
    maxgap = nptperyear/4, alpha = 0.02, wmin = 0.2)