Fig. S1.

Distributions of RBC extension for different $Ht$ values measured in SDPD simulations. Extension is defined as the maximum instantaneous cell length $l$ in the flow direction, as depicted in the first inset. Distributions include data from multiple RBCs in a suspension and are averaged over many time instances. Insets illustrate typical shapes for different values of $l$. The two extension regions marked by light yellow and light blue colors schematically depict $l$ ranges where polylobed shapes and creased discocytes are observed.