***************************************** Read Me *****************************************
*******************************************************************************************
Granular piston-probing in microgravity: powder compression, from densification to jamming
*******************************************************************************************

The present document was created to clarify the content of the repository doi:10.5281/zenodo.7101542. It relates to the article "Granular piston-probing in microgravity: powder compression, from densification to jamming" by Olfa D'Angelo, Anabelle Horb, Aidan Cowley, Matthias Sperl, and W. Till Kranz, published in npj Microgravity (2022).
All data plotted in the related manuscript is available here. Column names are made explicit in the following.

Figure 2a:
Time (in second): t_s
Position of piston (height, in mm), microgravity experiment: h-mug_mm
Absolute uncertainty (in mm), microgravity experiment: delta-h-mug_mm
Position of piston (height, in mm), ground experiment: h-gnd_mm
Absolute uncertainty (in mm), ground experiment: delta-h-gnd_mm

Figure 2b:
Time (in second), ground experiment: t-gnd_s
Pressure (in kPa) (top sensor), ground experiment: p-gnd_kPa
Time (in second), microgravity experiment: t-mug_s
Pressure (in kPa) (top sensor), microgravity experiment: p-mug_kPa

Figure 3:
Reference of experiment, ground experiments: ExpNbr-gnd
Packing fraction at jamming (global), ground experiments: PackFrac-gnd
Formal uncertainty, calculated on each packing fraction (see Methods section IV.5), ground experiments: FU-PackFrac-gnd
Reference of experiment, microgravity experiments: ExpNbr-mug
Packing fraction at jamming (global), microgravity experiments: PackFrac-mug
Formal uncertainty, calculated on each packing fraction (see Methods section IV.5), microgravity experiments: FU-PackFrac-mug

Figure 4a-position:
Time (in second): t_s
Position of piston (height, in mm), ground experiment: h-gnd_mm
Absolute uncertainty (in mm), ground experiment: delta-h-gnd_mm

Figure 4a-pressure:
Time (in second) (bottom sensor), ground experiment: t-low-gnd_s
Pressure (in kPa) (bottom sensor), ground experiment: p-low-gnd_kPa
Time (in second) (top sensor), ground experiment: t-up-gnd_s
Pressure (in kPa) (top sensor), ground experiment: p-up-gnd_kPa

Figure 4b-positon:
Time (in second): t_s
Position of piston (height, in mm), microgravity experiment: h-mug_mm
Absolute uncertainty (in mm), microgravity experiment: delta-h-mug_mm

Figure 4b-pressure:
(Here, unlike in most experiments, both sensor readings are recoded using the same timer.)
Time (in second), microgravity experiment: t-mug_s
Pressure (in kPa) (bottom sensor), microgravity experiment: p-low-mug_kPa
Pressure (in kPa) (top sensor), microgravity experiment: p-up-mug_kPa

Figure 4c-positon:
Time (in second): t_s
Position of piston (height, in mm), microgravity experiment: h-mug_mm
Absolute uncertainty (in mm), microgravity experiment: delta-h-mug_mm

Figure 4c-pressure:
Time (in second) (bottom sensor), microgravity experiment: t-low-mug_s
Pressure (in kPa) (bottom sensor), microgravity experiment: p-low-mug_kPa
Time (in second) (top sensor), microgravity experiment: t-up-mug_s
Pressure (in kPa) (top sensor), microgravity experiment: p-up-mug_kPa

Figure 5a:
Time (in second) (top sensor), ground experiment: t-up-gnd_s
Pressure (in kPa) (top sensor), ground experiment: p-up-gnd_kPa

Figure 5b:
Time (in second) (top sensor), on parabolic flight: t-up-pfc_s
Pressure (in kPa) (top sensor), on parabolic flight: p-up-pfc_kPa

Figure 6:
Time (in second) (bottom sensor), on parabolic flight: t-low-pfc_s
Pressure (in kPa) (bottom sensor), on parabolic flight: p-low-pfc_kPa

Figure 9:
Time (in second) (bottom sensor), on parabolic flight: t-low-pfc_s
Pressure (in kPa) (bottom sensor), on parabolic flight: p-low-pfc_kPa