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Table 4.

Error budget on the calculation of secondary positrons.

Ingredient Error on [%]
ingredient [%] at (10−2,  1,  102) GeV( ⋆ )
CR and gas composition
CR H and He ±10% ±10%
+ CRs (Z >  2) +10%
+ ISM (Z >  2) ±3%

Energy losses
ISRF #1 → #2( † ) ( + 0.2%,  − 2.7%,  − 4.1%)
B ±1 μG ( ± 0.7%,   ∓ 9.5%,   ∓ 12%)
ne ±10% ( ∓ 0.2%,   ∓ 0.7%, ​ <  ​0.1%)

Transport calibration and positron production
K0 \AMP  VA ±12% ( ∓ 7%,    ± 12%,    ∓ 5%)
(dσ/dE)prod +20% +20%

Surface density (ΣISM)
±50% ( ± 13%,   ± 0.7%,  ± 49%)
±50% ( ∓ 0.7%,  ± 26%,  ± 21%)

Solar modulation (TOA fluxes) [%]
ϕ ±15% (n/a( ‡ ), ∓50%,    <  1%)

Notes. The first column list the quantities varied in the calculation, the second column provide the typical uncertainties on this ingredient, and the last three columns show the corresponding uncertainty on the calculated IS secondary flux of positrons–the gas surface density impacts the calculation in different places, and its impact is broken down below (see text for details). A “+” sign below (instead of “±”) means that our calculation is conservative, that is, the secondary flux would be larger if we were to account for these specific ingredients. The exact numbers slightly depend on the configuration used (BIG, SLIM, or QUAINT) and we report below values from QUAINT. ( ⋆ )For energy-dependent effects, we report 3 values in the table, otherwise a single value is provided. ( † )Two parametrisations taken from Delahaye et al. (2010). ( ‡ )At very low energy, the TOA flux is strongly suppressed and its variation is not very meaningful to report.

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