From ad40077b4ef3989dd78714a269fdb7a484540f4f Mon Sep 17 00:00:00 2001
From: "W. Trevor King" <wking@tremily.us>
Date: Fri, 22 Feb 2013 12:49:45 -0500
Subject: [PATCH] scatter: fix stupid --vx0-energy minus sign

---
 scatter.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scatter.c b/scatter.c
index ed164ae..aa50c87 100644
--- a/scatter.c
+++ b/scatter.c
@@ -343,7 +343,7 @@ void parse_args(int argc, char **argv, state_t *state, system_t *system,
 			state->x[2] = safe_strtod(optarg, "vx0");
 			break;
 		case 'e':
-			state->x[2] = -sqrt(2*safe_strtod(optarg, "vx0-energy")/system->m);
+			state->x[2] = sqrt(2*safe_strtod(optarg, "vx0-energy")/system->m);
 			break;
 		case 'Y':
 			state->x[3] = safe_strtod(optarg, "vy0");
-- 
2.26.2