I tried the solution offered in Two figures side by side and on overleaf.com: Positioning images and tables) see at 'Multiple images in one figure'. But both show the image one below the other.
Is there a way to show them on them side by side in the twocolumn class?
this is heade of my code:
\documentclass[twocolumn,prl,nobalancelastpage,aps,10pt]{revtex4-1}
%\documentclass[rmp,preprint]{revtex4-1}
\usepackage[latin9]{inputenc}
\usepackage[english]{babel}
\usepackage{graphicx,bm,times}
\graphicspath{ {C:/Varie/UNI/MANO/I-semestre-2018/fraboni/esperimenti/RT/pictures/}{C:/Varie/UNI/MANO/I-semestre-2018/fraboni/esperimenti/RT/pictures/experimental-apparatus-RT} }
\usepackage{subcaption}
\usepackage{lipsum}
\usepackage{mwe}
\begin{document}
Best Answer
You probably have an empty line between the two images; that necessarily inserts a paragraph break between them, effectively putting one below the other.