Allowable Eccentricities
I've figured out how to pick out the runs where the orbits of E and B intersect.
Out of about 22,000 runs, the orbits of E and B intersect only 200 times. Here is the contour plot of those doomed Mercury runs.

seen from United States
seen from China

seen from Malaysia

seen from Singapore
seen from United Kingdom
seen from Hong Kong SAR China
seen from China

seen from South Africa

seen from Malaysia
seen from China

seen from Türkiye

seen from United Kingdom

seen from Malaysia

seen from France
seen from China

seen from Italy

seen from Hong Kong SAR China
seen from Saudi Arabia
seen from Indonesia
seen from Argentina
Allowable Eccentricities
I've figured out how to pick out the runs where the orbits of E and B intersect.
Out of about 22,000 runs, the orbits of E and B intersect only 200 times. Here is the contour plot of those doomed Mercury runs.