English: The axes span ~60 order of magnitude (logarithmic scale)! The upper limit is provided by Planck scale, lower limit is from dynamical breaking of chiral symmetry by quantum chromodynamics. The right panel shows a zoom-in of the small box. The lines show the limits of 9 life-permitting criteria:

1. Above this blue line, there is only one stable element, which has the chemistry of helium with no known stable chemical compounds
2. Below this blue line, the only stable element consists of a single particle, which can combine with a positron to produce an element with the chemistry of hydrogen. A handful of chemical reactions are possible, with their most complex product being an analogue of H₂
3. Above this green curve, neutrons in nuclei decay, so that hydrogen is the only stable element
4. Below this green curve, protons in nuclei decay, so that any atoms that formed would disintegrate into a cloud of neutrons
5. Above this violet line, deuteron is strongly unstable. Stellar nucleosynthesis would fail
6. Below this light blue curve, isolated protons are unstable, leaving no hydrogen left over from the early universe to power long-lived stars and play crucial role in organic chemistry
7. Below this dark violet curve, the diproton is stable. Protons can fuse to helium-2 via a very fast electromagnetic reaction, rather than the much slower, weak nuclear pp-chain
8. Above this orange line, the production of deuterium in stars absorbs energy rather than releasing it.
9. Below this red line, a proton in a nucleus can capture an orbiting electron and become a neutron. Atoms are unstable
10. The red arrow points the region potentially suitable for complex life (small green region with light green dot)

Created according to "Barr S. M., Khan A., Anthropic tuning of the weak scale and of mu/md in two-Higgs-doublet models. 2007, Physical Review D, 76, 045002. https://arxiv.org/abs/hep-ph/0703219" by OpenOffice Calc 3.1.1