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. 2020 Nov 17;10:19954. doi: 10.1038/s41598-020-75814-y

Table 1.

Simulator parameters.

Category Parameter Notation Unit/format
Geometry Reference image .TIFF, PNG, JPG, GIF
Image pixel size µm/pixel
Region file .rgn or .roi
FRAP laser spot 2.8 µm
FCS laser spot width σFCS 0.25 µm
Molecules Numbera 1–150,000
Initial position Uniform or estimated
Times Simulation durationa

1000–100,000 frames

(40–1600 s)

Time step Δt 2–100 ms
Diffusion coefficients Outside contact Dout 0.3 µm2/s
Inside contact Din 0.3 µm2/s
Trapped Dtrap 0.04 µm2/s
Crossing probability Pcrossing 25–70%
Kinetics Binding rate kon 0.15 s−1
Unbinding rate koff 0.015 s−1
Photophysics Switch-on ratea konFluo 0.005–5 s−1
Switch-off ratea koffFluo 0–10 s−1
Bleaching ratea koffBleach 0.4–4 s−1
Activation ratea koffActiv 1–2 s−1
Export files SPT or SRI images .TIFF or multi-TIFF
SPT trajectories .trc
SPT histogram .txt
FRAP curves .txt
FCS fluctuations and autocorrelation .txt

aSee the methods above for the specific molecule numbers and photo-physical parameters used in the various imaging modes (SPT, STORM, FRAP, PAF, FCS).