g_string_append_printf(ctx->header, ";Channels: %d\n", num_enabled_probes);
g_string_append_printf(ctx->header, ";EnabledChannels: -1\n");
g_string_append_printf(ctx->header, ";Compressed: true\n");
g_string_append_printf(ctx->header, ";Channels: %d\n", num_enabled_probes);
g_string_append_printf(ctx->header, ";EnabledChannels: -1\n");
g_string_append_printf(ctx->header, ";Compressed: true\n");