Birth radius distribution of stars found at the solar radius today (inside the gray vertical strip) of, from left to right, the two cosmological models Model1 and Model2, and the APOGEE DR17 red giant sample. The black curves are for the whole sample. In the top row, the blue and yellow curves highlight stars found today on orbits with e < 0.2 (cold) and 0.2 ≤ e < 0.5 (warm), respectively. The percentages that warm and cold stars born inside R_bar represent in the SNd are indicated in the top right of the panels for each galaxy. In the middle row, R_birth distributions are shown for different monoage populations. From purple to red, stars get older and older, as indicated in the color bar. In the bottom row, R_birth distributions are shown for different metallicity bins, blue and red representing metal-poor and metal-rich stars, respectively as indicated in the color bar.