R Under development (unstable) (2023-08-09 r84924 ucrt) -- "Unsuffered Consequences"
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> suppressPackageStartupMessages(library(stars))
> bcsd_obs
stars_proxy object with 2 attributes in 2 file(s):
$foo
[1] "[...]/bcsd_obs_1999.nc:pr"

$bar
[1] "[...]/bcsd_obs_1999.nc:tas"

dimension(s):
     from to offset  delta  refsys                    values x/y
x       1 81    -85  0.125      NA                      NULL [x]
y       1 33  37.12 -0.125      NA                      NULL [y]
time    1 12     NA     NA POSIXct 1999-01-31,...,1999-12-31    
> L7_ETMs
stars_proxy object with 1 attribute in 1 file(s):
$L7_ETMs
[1] "[...]/L7_ETMs.tif"

dimension(s):
     from  to  offset delta                     refsys point x/y
x       1 349  288776  28.5 SIRGAS 2000 / UTM zone 25S FALSE [x]
y       1 352 9120761 -28.5 SIRGAS 2000 / UTM zone 25S FALSE [y]
band    1   6      NA    NA                         NA    NA    
> if (require(starsdata, quietly = TRUE)) {
+ 	print(stars_sentinel2)
+ }
> 
> proc.time()
   user  system elapsed 
   0.85    0.20    1.00